There’s no real reason you have to use a platform like Substack to send email. If you want to get into making a newsletter of your own, understand your options.
So put work you care about less—work for hire, short-form editorial, dumb jokes, random experiments—on platforms you don’t control, where the risk of failure is a distinct possibility. Leverage the resources of what else is out there. But when you’re working on the stuff that does really matter to you, put it in a place you have ownership of. Put it on your website. Send the newsletter using tools you run or manage—and be willing to pay for that right.
Source: You Don’t Need Substack To Build an Email Newsletter