To name and shame two: LinkedIn and MyHeritage. If you ever made an account with either of them, they will never stop spamming you. They have configuration options to select which mail to receive, but they appear to consider them temporary suggestions.
A special dishonourable mention goes to Wal-mart. I never interacted with them in any way whatsoever, as well I wouldn't since they don't exist on my continent as far as I know, yet they still send me spam. DKIM signed and all!
LinkedIn once seemed to somehow go through my (GMail?) contacts and ask if I should invite my, late, grandfather to the platform in the subject of a marketing message.
I guess you also received the Linkedin Gaming spam a couple of weeks ago?
I opted out of almost every category and I never opted in to a category like that. So why is there now a new category which I have to opt out of?
It seems to me blatant, unpunished disregard of GDPR - but their whole business was founded on abuse of emails and there's no reason to expect a Microsoft acquisition to make a company act more in line with the law.
That gaming email took me mentally straight back to Facebook circa 2009, and not in a good way. LinkedIn always serves as a fantastic example of exactly how not to treat your users.
A special dishonourable mention goes to Wal-mart. I never interacted with them in any way whatsoever, as well I wouldn't since they don't exist on my continent as far as I know, yet they still send me spam. DKIM signed and all!