

It’s definitely free labour. Even if you don’t mind doing it, it’s still that. As for the rest, I’m sympathetic to your point of view. I have used reviews and occasionally left reviews on products I liked particularly. However, online reviews are so gamed at this point that I don’t think anyone ought to feel pressured to leave a review like they try to do with the emails OP is receiving. It’s one thing to like a product so much you are moved to leave a review. It’s another to be asked for it every time you purchase something.
In practice, liberals and anarchists call anyone who defines themselves as a communist a tankie. Liberals will frequently use it for anyone who claims to be any sort of socialist.