How am i moving a goal post? I'm making that differentiation because it wasn't made in the initial comment:

Assuming unsubscribe works and isn't just confirming your email is valid.

If you assume something, context matters. Later in the chain it is pointed out one context could be spammers:

If some anonymous spam farm in India sends you more spam after you unsubscribe, what exactly is Canada going to do about it?

Which is why I'm pointing out that is not the only possible context and you can make a differentiation. Nowhere am I saying unsubscribe buttons always work or are always to be trusted, nowhere am I saying this only applies to newsletters from genuine companies. You can only move goalposts once it is established where those posts are in the first place, bud.