On my email that is just publicly used on my Github account I have repeatedly received marketing emails from the company behind Redpanda since 2021 without ever consenting to such and without any way to opt out. Replying to the email that I wish to not receive them has not helped. The newest email from this year has a “Not interested” button, so apparently they have learned a bit. Let’s see if it actually works.
I can not imagine this shady tactics get much love from developers, rather they probably turn away people from trying your product, at least for me this is the case.
I have zero tolerance for scraped email spam, and every single entry in that blocklist doesn't do shit when you send a complaint on their abuse@ email.
If you host your own email server, this tool/repo allows to generate ready-to-use blocklists for postfix and dovecot.
[1] https://github.com/cookiengineer/postfix-spamdb