I find the post to be pretty unnecessarily unforgiving; if you've worked in this industry for more than a minute, you understand how this sort of stuff happens. This is clearly not a marketing list - it's a compliance list on the first one, and a statuspage style one on the other. To call them spam is disingenuous, and to draw a line from "my email is on multiple lists and taking my name off one doesn't take it off all" to "Don't trust this company with your personal data" is really only fair if your email address is firstname.lastname.momsmaiden.childhooddog.bankaccountnumber.birthdate@gmail.com.

Edit: I'm aware that GDPR considers email as confidential PII, but my post isn't legal advice. I just don't see my email as confidential.