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They were great memorable and ad-free sites that simply showed you your own (or your NAT's) public IP, as seen by the HTTP server.

Looks like he had useful info up for people.... I never heard of it before today either: https://ip4only.me/home.cgi

To know your IP

I'm puzzled why you have been downvoted for asking a genuine question (and all credit to those who have taken time to respond to you).

Perhaps the downvoters would care to explain their actions?

The question may be genuine but its phrasing probably suggests an allegation to most readers.

I didn't downvote, but the question was answerable by simply visiting the domains typed into the comment.