Google Groups spam: Why so many people are currently receiving emails

I've received over 100 emails this year from these dubious mailing lists. And each mail I checked has a "X-Google-Group-Id" header. I hardly get the spam, but mostly notifications from strange email servers. "Thank you for your message," or "I'm currently out of the office," or "This email address is no longer valid.". and the servers respond to each other "Thank you for your message titled 'I am out of office'"...

a) Are they really sent by Google Groups?

b) Why does Google allow any person to create an google groups mailing list and add my email address to it without my consent?

c) Are there really still people who have configured their autoresponders to automatically respond to autoresponders through email lists in 2025?

Why are people still using Gmail, or any google product for that matter

I dont understand the "corporate awe" regarding google.

if your wife, husband or partner cheated on you, I am sure you would not stick around, and boot them out of the door. why is it any different for a tech company who consistently cheats

this issue is easy to solve

change email provider and stop complaining about a company that exist to fuck you over.