I figured there are interesting people out there who don't really blog often, but who might post something online a few times ever year and whom I'd like to stay updated on. So I started trying to collect some of these relatively inactive personal feeds.
It's not ass noisy as following blogs or social media, which is what I like about it. The only drawback is of course that so few people maintain an RSS feed.
I think the key here is that it's a feed managed by the user. There's not enough commercial potential in that. As a tech company, you want to be the one curating the feed, and you want the user to believe you're doing it in their best interest so they don't notice how you're making money by subtly feeding them ads.
RSS is simply too good for the contemporary internet.