I've experienced these kind of things so many times that I am literally obsessed with what I check when I sign up to something, never had issues after that except for very rare cases.
Checking what can and cannot be sent to my account must be taken seriously. I'm like a firewall, deny EVERYTHING by default, if something interests me (almost never) then I'm willingly subscribing.
When I can't unsubscribe from something I get very frustrated and I always go full annihilation mode and create a new rule to sweep everything coming from that domain to junk and instantly delete everything, I don't care.
Checking what can and cannot be sent to my account must be taken seriously. I'm like a firewall, deny EVERYTHING by default, if something interests me (almost never) then I'm willingly subscribing.
When I can't unsubscribe from something I get very frustrated and I always go full annihilation mode and create a new rule to sweep everything coming from that domain to junk and instantly delete everything, I don't care.