Sort of true, but the algorithm that Reddit-like platforms use is transparent and simple (it’s just based on likes and dislikes, and I think you can even look up the source for the sorting modes) and hence doesn’t directly try to feed you content that’d enrage you. I can just not read the posts about Musk and Trump, since I find most takes on the former bad and don’t care much about the latter. Meanwhile, on platforms like Twitter or Tiktok you are directly fed content out of some recommendation ML model trained on user engagement.

(There’s also subtler differences. For example, on Reddit/Lemmy/etc, if you hate a post you can dislike it, which will generally make it show up less to people. But on, say, Tumblr, not only are there no dislikes, but if you are really hate a post you can only respond to it by reposting it, therefore spreading it further among your followers! That’s an absolutely devious platform-design move that could have been invented directly by Satan himself.)