The researchers will not lose anything, only the publishers. Researchers are paid by (usually) universities, and often post preprints i.e. the paper without the publishers formatting, since wider dissemination is usually better.
Luckily in computer science a lot people know how to host there files themselves or use https://arxiv.org/
That is right, researchers are paid by the universities. BUT, to be hired researchers need a strong list of publications in peer-reviewed journals. This is usually the most influential factor for ranking. For this reasons some journals charge fees for publishing your paper, not saying about being paid.