I think where people have trouble is when they spam every article or video about the topic into the post. If people see a flood of posts coming from somewhere, they might unsubscribe or block it.

Share good quality content when you find it. I think it becomes spam when you are posting a bunch of posts at once, or if it's a bot that's posting junk constantly. A few good quality posts a day, spaced out by a few hours, wouldn't be seen as spam.

You don't have to post that much, that's just what I'd consider the upper limit