I would think the opposite -- YouTube makes most of their money from advertising on videos, so the driving goal is to get users to watch as many videos as possible. The algorithm they use is a big part of that, but RSS feeds are probably a pretty good way to get people who only watch a handful of channels back the site (as the RSS feeds are just links to the video pages, without video embeds).
That's a valid take. Though, not all videos are equally ad-ridden. I suspect if I were to start using rss to subscribe to channels I'd be favoring those that don't make much use of them. But yes, it's not so cut and dry.
