How is charging for a particular feature “scammy”? Every feature that you want should be free?
How is allowing feeds from a particular site a "feature"? They actually had to do extra work to block those feeds for the free tier.
Maybe Gmail should add a paid feature to allow email from Amazon.
Reddit has RSS. Here is an example - http://old.reddit.com/r/all.rss . To subscribe to it, you need to pay 12 dollars per month to Feedly. And this I think is scammy.