Earlier quoted context omitted.
there's a line in the movie the incredibles where robert (the hero) is meeting with the designer (edna) of super suits to design him a new suit even though such activities are technically illegal. The dialogue goes something like this: robert: you know I'm retired from hero work. Edna:As am I, Robert, yet here we are. so now it's 2023. you're telling me it's now safe to click on unsubscribe to the spam emails. yet he…
When you mark an email as spam, the mailing service emails the sender along with all the original headers. See https://en.m.wikipedia.org/wiki/Feedback_loop_(email) Your reasons are not actually rational.
i appreciate its impossible to prove a negative (everyone could be doing something they have no evidence or documentation of doing), but given my mail provider both says that you have to mark a selection before they'll share such information with partners and that marking emails as spam still trains your own user specific spam filter, i don't think (and an really hoping) this is not a universal thing.