Google Ads and Facebook will block you in no time when you act with a huge budget.
To do email marketing you need to build a list first and that takes a lot of time.
Remains only Twitter, SEO, Word of Mouth, Guerilla. We actually have the same problems as PornHub. But PornHub has proven that you can build reach even with bans/shadowbans.
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).