Most often this probably comes from public VPNs, or from IPs that are blacklisted.
https://mxtoolbox.com/blacklists.aspxI noticed a long time ago that newbies appear, with a registration date of 2018, for example. They come up with stories that he registered and forgot, and now the time has come, he remembered about this account.
In fact, newbies who come to spam or register 101 accounts know the market for ready-made accounts very well.
Therefore, my opinion is that you need to buy a good non-public VPN, or, as ranochigo said, register with your IP provided by your provider.
I wouldn't agree with you completely.
I recently talked to a friend about bitcoin and he got interested.
I suggested this forum for more information and he tried to register.
He got this message saying he had to pay to unblock himself.
He tried to register from home and I'm 100 % he didn't use public VPN but IP from his Internet provider.
Of course he has completely given up on this forum and has no plans to pay anything.
Even if he wanted to pay he can't because he's just heard about bitcoin, he doesn't even have an open btc wallet, nor does he even know how bitcoins are sent or received.
He's a complete beginner on this and it's really funny of people like that, who by mistake or by chance ended up on this list, to ask them to pay to unblock themselves.
It's just not right and fair and no one can convince me otherwise.