I had basically the same idea following a similar thread in a forum around 12 years ago.
Not FBI,but something similar from my country. Luckily I only used it for my physically seperated guest network(totally different connection)
... Thanks to Ubiquiti being asshats and not telling people about a zero day for months it got hacked and renamed into "FreeWeedAndFreeBeerIfyouringat{MyLastName}". They even replaced the background of the portal page with a carefully crafted picture explaining how they did it.
... I very much suspected the two CS students next door,especially as the range was shit and it was either them, someone with a really sophisticated array and (as you couldn't park in our street it would even be hard for a average wardriver to do so easily) and I very much rule out the 90 year old lady below us or the family who both were,well,rather non technical it seems. (He asked for help to set up his TV)
... As revenge,when one of them got a girlfriend who was as pretty as she was loud we set up a small open wifi on a mikrotik device which was just strong enough to go through one wall that was named "WeCanHearYouHavingSex" that lead to a fileserver that had a .wav in it with a five second proof of that and then Rick Ashley.
... He kindly asked for that being turned off before christmas when his parents would visit.
If that was in eastern Germany 10 years ago...that was me and I had my reasons,see above.