They can be, but they usually mostly aren't. Showing people what they like is the best way to get them to come back.

I think you need to accept that what you want is different from what most people want.

> I want the platform to be a dumb pipe between me and the people I follow.

I guess your only hope would be to make it illegal, worldwide, to provide algorithmic feeds.

Hacker News uses an algorithmic feed, and that's why we're here talking. https://news.ycombinator.com/newest exists but it's not very good. You can also browse Reddit chronologically https://www.reddit.com/new/ but, seriously, don't bother.

So, as long as someone can do algorithmic feeds, someone will, and people will use it, even you, because algorithmic feeds are just better than chronological feeds.

> I don't want "influencers" to be possible.

This one is truly hopeless. We've had influencers at least as long as we've had the written word.