Facebook will ban us but Google ads I think still have some merit.
I've been working on a newsletter/mailing list. The problem is we can't use services like Mailchimp; we're automatically banned from those. Been working on a self-hosted and hopefully decentralized solution.
This is working very well: https://sendy.co/ + Amazon SES.
Edit: This is the cheapest solution for huge lists (100k+ mails).
I would rather stay away from Amazon if possible. I did review it earlier, it remains an option.
The hard part is to build a list (outside our bubble).