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My solution to this spam is that I changed one letter in my LinkedIn name to a Unicode that looks like a letter but isn’t (think math symbol, etc).

If I get email or a message that includes that character, it proves software sent the message and it wasn’t typed by a human.

Won't that also block anyone who copy-pastes your name? I often copy paste names so that I don't make typos.

Yeah, even if the name is very familiar, botching that first-impression makes it relatively high-stakes.

It only gets worse from there when I'm trying to contact Krzysztof Wiśniewski.

you're using the domain-typo squatting trick for good - kudos!