But, to the OP, yeah you should never have any real funds in a custodial wallet. This is not even new with regulations being tightened. Custodial wallets have always been a risk because they could just vanish with no notice.
Yep, I've seen that happen so many times over the years, especially with exchange wallets. And why in the world would anyone use a web wallet these days? I remember back in 2015 there used to be a few that I'd experimented with, but that was before I knew up from down in the crypto world.
OP, I didn't read Leo's posts about this, and although you said there wasn't any specific news motivating your warning, have there been any new developments that would make the community think that the FBI (in particular) would be involved in hunting wallet creators down? I'd think that would fall under the jurisdiction of the IRS or some other alphabet agency, but I'm no expert on who's trying to tackle the oh-so-enormous problem of crypto money laundering and funding of terrorism....lol.
We need a Republican in office, and even though I'm not a Trump fan it looks like there aren't many other options.