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The best route is either to roll your own or go with a service like Ghost. Sure, you'll have to pay hosting, but you're not going to have shitty ads run on your blog.

Substack seems to be a decent technology; the problem is that it's owned by Y Combinator, which means it can't be trusted--if you piss off whoever's running YC at the time, you can be suddenly banned and have your data stolen.