I'm perhaps idealistic by saying that at least some of this time, these things can coexist. It's ok to make money doing a thing. I'm reminded of this video that makes an excellent point:
Part of the problem is that most of this works. If you pick up heavy things, you will get stronger. If you're trying to differentiate yourself you'll focus on specific techniques or sports, but really, the basics are not hard: do something that's difficult and your body will adapt to improve its ability to do that thing.
However, some specifics that I've found useful:
Barbell Medicine - focuses on strength training, not just barbells.
The Bioneer - a little lifestyle heavy, but the basic advice is sound.
Alan Thrall- also barbell focused, but lots of good advice to be gleaned there, including on bodyweight.
Ross Enamait - boxing focus, but bodyweight stuff. His book "Never Gymless" is good.
Underground Strength Gym - an oldie, but a goodie.
I think its a bit of a stretch to lump exercise simply into medical/health advice. I wouldn't tell you to go on YouTube to diagnose an illness you may have. But OP asked for guides on at home workouts and I think that YouTube is more than sufficient and safe for learning about what different exercises may be available.
I’m sure there are some channels that are ok, but my cynical take is that most channels are there for one reason: to make money (by getting views).
This is often (usually?) contradictory to giving good guidance, vs. telling people what they want to hear.