InvalidArguments

I've been wondering about the legality of a particular practice that I am encountering more often lately. People are recording multiplayer video games in which I am a participant (this includes audio of my speech). For sake of argument, let's say they are then posting these videos to sites like Twitch in order to monetize them. I'm aware I have no expectation to privacy in a public setting and can be legally recorded by anyone (though I'm not clear if they can then monetize their recording legally). I'm wondering if this practice is legal. To clarify some variables:

1. What if I'm not notified they are recording? (this is an academic question I suppose because if I didn't know I would

If the TSA does not have police powers, how are they able to detain anyone to do even the search they do? If they can't legally hold you, why not walk right by them? I don't want to hear "because they can." I want the settled legal reasoning for how this is possible, or have we all just been conned into consenting to this theatre without realizing it?