What laws does forced registration without confirmation violate?

Question

Law in IT

Is any law being violated, and if so, which one?
3 different points are of interest:
1. when a user leaves an email in a form that is not related to registration, registration takes place, which is used later for mailings. The username is sent to the user. no checkboxes for familiarizing agreements, etc. no
2. after regular registration, instead of email confirmation, a letter arrives with a login and password
3. using email for promotional mailings without user approval

Answer 1

152 fz. GDPR European privacy law, intrusive advertising law.

Answer 2

Well, for example here (subheading "Responsibility"). If you want to fly into pollama - you are welcome.