I have had some luck running puppeteer in a nodejs app hosted at glitch.com. I spring for the (cheap) paid hosting and get several containers for dev/test/prod, web based ide. Obviously, this would only scale to a point. In my case I just need a single client automating interaction with a single site. If I really needed scale, I'd probably use one of the services listed elsewhere.

Of course, if you don't need a full javascript-enabled browser parse, consider alternatives first: simple HTTP requests, API, RSS, etc.