Lemmy, piefed, and mbin are all similar pieces of software that run on a server.
They are each capable of hosting a small social network website with a similar reddit-like format. They all also support the activitypub standard, which means that they can be linked together, so that when you go to one of those social media sites (lemmy.world for example) you can see any other site that they're "federated" with, even if that social media site is powered by a different software that supports activitypub (I'm on lemmy.world but I can see communities and posts from piefed.social)
I generally call lemmy, mbin and piefed "fediverse platforms" because they're each a platform that you can make a fediverse account on, but that usage is a bit imperfect, since each individual site could also be described as a platform, and is where your account is actually hosted. You could be more specific and call them "fediverse/federated link aggregators" if you wanted to specifically refer to the ones with a similar format to reddit.
These pieces of software are different because they're built in different ways (different languages and underlying structure), have different priorities, and as software projects are run in different ways with different leadership, all of which is how you get differences in features and implementation. Lemmy is the oldest of these similar platforms, and as such is the most established. In the open source world it's very easy and common to end up with a lot of fragmented similar projects. Its both a blessing and a curse.
There isn't perfect language for all these things because in the grand scheme of things, it's a rather new way for social media platforms to work, so the language around how to describe or refer to these things hasn't really "settled"
It can federate with lemmy, essentially just being another type of node in the same web of individual websites.
Some of those sites are hosted with lemmy, some are hosted with piefed, some are hosted with mbin.
Each of those (lemmy, piefed, mbin) is a piece of software that can run as a "server" for a social media site, and can use the activitypub protocol to talk to other sites that are federated together making the contents of other sites visible. They can federate regardless of whether the software powering the site is the same or not.
At some point I will but I'm not currently ready to make that transition. My friend and I are using Duolingo together and the social aspect plus the familiarity of the structure have been really helpful
They walked back the ai thing (at least that's my understanding about it, I think there was a statement about it, not that that means much) but it's very clear it wont be something that's likely to work for me long term
But for the time being the structure that it provides and its format has helped me build a routine and actually stay pretty consistent, and I don't think I'm at a place yet where I can transition away from it
But I have checked out the Foss options and there were some neat supplemental tools on f-droid, and at some point I'll go through the play store and try out direct alternatives
I'll have to try this again for my little media center setup. If I can sync with desktop I'll be much happier to use it on mobile
Still struggling to ween myself off youtube recommendations though 😅 thats the biggest thing missing for me, it's soooo much harder to discover stuff or find things I want to watch with grayjay or newpipe, and if I just jam a million things in my subscriptions I'll just end up with lots of things I'm not interested in watching at any given point in time
I should probably add more stuff and just add them to more subscription groups which can kinda help with that. If anyone has recommendations I'd welcome them :)
I believe this is what the post looks like when it's a cross post using the crosspost functionality (like using the crosspost button if your client has one)
For me your post shows up as one of the places this was also posted which tells me this was cross posted from one of the many times this has been crossposted across various comms, including your original post
I really wish the UI was more unambiguous about something being a crosspost (its really unclear on all I've used, but some at least let you find out if you go looking and try to check), which is why I always add some text to say "this is a crosspost" and sometimes the original location I got it from when I crosspost stuff
From the text of their original post it sounds like you're still allowed to say that. It's worth reading the post text itself (not saying that to change your stance, I have complicated feelings about this choice by them, but knowing what they're actually saying is worthwhile)
That makes so much more fucking sense, thank you lol