I only do the unsubscribe if it’s somebody i’ve dealt with before, otherwise just delete. Unsubscribe sometimes takes a few weeks, if I keep getting stuff and it seems unsubscribe has not had an affect I will block the domain. FWIW I use Protonmail
That doesn't address the problem of crowded inboxes, though, which 'unsubscribe' is supposed to remedy.
I like the idea that some offered to create a rule to just move the offending spammer into the delete file. Or mark ass spam and let the platform handle it.