Isn’t there a patent / copyright or something for taking all the algorithms / structures in the tech stack that this relies on? (GAN , densePOSE , etc) Is any

Isn’t there a patent / copyright or something for taking all the algorithms / structures in the tech stack that this relies on? (GAN , densePOSE , etc) Is any tech that is published in arxiv just free game immediately? Seems unfair to the researchers