Medium is terrible, I don't quite understand why people allow a company to monetize their blog for medium's gain. But, that's their choice, not mine.
Which is a completely different approach than building one's own business. These platforms can still help drive traffic to a decent website though.
I use it for professional stuff that needs to be linked to but which isn’t on an official blog property of some sort.
I do keep a personal blog but sometimes cross-post to Medium.