Technically, switching pools is trivial. In practice, not so much. Foundry is the only option for regulated US public companies, the majority of the total hash rate. If it is so trivial for the rest, why do they sell their hash rate to Antpool, which has a track record of attacking Bitcoin and shipping closed source firmware with backdoors? Ask nostr:npub1wnlu28xrq9gv77dkevck6ws4euej4v568rlvn66gf2c428tdrptqq3n3wr or nostr:npub1lh273a4wpkup00stw8dzqjvvrqrfdrv2v3v4t8pynuezlfe5vjnsnaa9nk, who know 1000X more about mining than the OP.
Discussion
Regulated hashrate is terrible indeed. But which US law says Bitcoin miners are only allowed to connect to Foundry?
Anyway, the entire point of mining is to do it in secret, without having to tell the government. Maybe miners don't want to risk legal issues now but if their choice is lose the value of their investment (which 51% attack would cause) and risking legal issues they may as well pick the latter. The point of selling hashrate is to decrease variance and if Antpool is not harming BTC right now it's not a big deal.
I don't need to ask "authorities" that are about the same level of knowledge as me.
It is impossible to say given the size of the Federal Register, but most of the hash rate is owned by compliance bros anyway. I’m all for wildcat mining but you have to be realistic about it - it is hard to make that profitable competing against corporate miners buying power with special agreements from utilities and plenty of fiat financing.
Yes, until people start paying premium for inclusion of censored transactions.