Adsb.fi and airplanes.live were once in the same Discord server and worked together for several months rebuilding the community when adsbexchange sold out. I believe the original plan was to create a community where no one person could sell out and rug pull all of the donated data again, but I believe the owner of adsb.fi, Samuli, decided to take his data out of the community and go solo.
I've only heard one side of the story and so it might be biased against Samuli.
I would join his Discord server as well but I've used all of my server slots. It's a bit ridiculous of Discord to limit the servers a person can join, especially those who pay $10 for Discord nitro.