https://old.reddit.com/r/trackers/comments/1jhgum1/revolutiontt_false_information_debunked_by/
There's this post on reddit by the RevolutionTT admin from 1 month ago. The admin says they sent out mass emails to old users. Reddit users are saying that this is a scheme to bait for money donations.
These are just the rules of the community called "The Scene". Fitgirl is not scene, for example. Also torrent sites are not part of the scene. Groups which release their content to torrent sites are usually called P2P groups. Torrents have built in hash checking as part of the torrent protocol. A release is only "The Scene" if it is listed in a predb.
The reason that Scene use CRC32 is probably because the scene is focused on racing. SHA256 would have a much longer calculation time. The scene has bunches of different groups, but there is only allowed to be 1 scene release per content slot. The scene rules set a minimum quality requirement. Whichever group fills the slot first has their group name in the predb forever. If a release is a duplicate or doesn't match the rules, then it gets "nuked". The groups compete with each other to be fastest.
I think also the CRC rule was originally decided in 1998. This might be the main reason.
https://scenerules.org/html/1998_GAMEiSO.html (1998 scene game release rules)
https://scenerules.org/html/2021_GAMEiSO.html (2021 scene game release rules)
https://en.wikipedia.org/wiki/Standard_(warez)
https://en.wikipedia.org/wiki/Simple_file_verification