Rent seeking is collecting money while adding no economic value. Like landlords.

If an AI can do your job then you add no economic value, you are just collecting rent by preventing an AI from replacing you.

Unions don't add economic value, hence why employers don't like them. The way they secure higher pay is by going on strike, not by offering more production or value.

Unions provide training, good healthcare, and safety, which very much add economic value. Employers typically have the full force of market forces to pay as little as possible. Collectivisation is the workers only means to advocate for themselves.

if you think that then buy a house instead of renting

Let's throw in a yacht as well. Why would anyone not get one of those too?