The actual text that all Brave users are seeing when they visit Lobste.rs is:
Blocking a cryptocurrency scam where the Brave browser pretended to be fundraising on behalf of a site without that site's knowledge or consent, then lied about funds being held in escrow and kept them for itself. For details:
https://github.com/lobsters/lobsters-ansible/issues/45
and
https://github.com/lobsters/lobsters/issues/761
Edit: repeated below comment.
As I understand it, Brave added a "donate to lobste.rs" link when viewed in their browser, and then kept all the money.
If you are using Brave, confirm any donation (and maybe anything else involving money) in another browser.