There's a lot of services doing that already, it's a very small market. There are also a bunch of open source projects doing that already. I built one myself (https://github.com/dewey/feedbridge) but there are better and more powerful ones on Github.

FetchRSS is basically this https://fetchrss.com/prices

https://inoreader.com does that for about that price.

The point of RSS is to not have to scrape the sites.

I still miss Yahoo Pipes.