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Doesn't that defeat the purpose? Surely anyone savvy enough to be dealing in black-market e-mail address lists is savvy enough to just remove everything after the + sign?

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Probably yes. The software I'm using supports configuring the character per domain, so I can use say . instead of +, so I could use myname.service@example.com which I assume would solve that.

You never use the bare address. If it gets stripped then it gets binned.

What do 'bare address', 'stripped', and 'binned' mean in this context?

I don't agree with him, but he means you never use the email address without a "+service" in it.

Then, if the spammer strips (removes) that part, it gets sent to the trash (binned).

Works well until you encounter a service that thinks you can't have pluses in emails

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