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I am just intrigued at which site must have been hacked, but guess I will never know.
You should ask which ones have NOT been pwned instead, the list is probably shorter.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
When I sign up to a site that requires a password, I generally use a unique email address. (I own my domain name so can have unlimited email addresses; there's a catch-all that routes non-existent addresses to my "real" mailbox, but retains the original "to" address. This way if I get spam addressed to "codeproject@[mydomain]" I can be pretty certain that it was CP that leaked my details / sold my address (for instance).
The only pain is if, when contacting them for any reason, they insist on having a sending address that matches what you signed up with. But they're few and far between.