I had the exact chain of thought, only to find that traffic of the site I built is at the mercy of how Google decided to rank webpages, and putting AI > youtube > Reddit in front of everything else.
> - Mailing lists beat social media accounts.
Similarly, Google set the metric for what counts as spams. Your emails can all go to the spam folder if their AI decides it should.
On (2), they can, but if you use a more established provider like Buttondown or Mailchimp, and you are not actually sending spam, a lot of folks have quite a bit of success building an audience that way. I've used Buttondown (not affiliated with them in any capacity) personally before and haven't had subscribers complain about deliverability. I am planning on rebooting that this year to see how it goes. I've heard most deliverability issues arise when folks trying to roll out their own email server.