The content stealers will have no problem scraping your HTML if you just provide summaries in your feed.
In fact my feed has full content and based on the differences in HTML in my feed and the direct page it seems like most often they scrape the page anyways.
Oh, they absolutely do. It's all automated bots. What people don't understand however is that you can report it to Google and/or file a DMCA on it yourself. That's all part and parcel to having any kind of public output.
I’m genuinely asking because to me, who cares if someone steals my content. They can steal it anyway, people will scrap your site if they need.
But I want the user experience for the users to be the best possible.