“WASHINGTON (AP) — A judge on Monday ruled that Google’s ubiquitous search engine has been illegally exploiting its dominance to squash competition and stifle innovation in a seismic decision that could shake up the internet and hobble one of the world’s best-known companies…”
The problem is not having the monopoly, it’s exploiting it’s qualities. Google for example exploits the fact that they know how much ad revenue each site makes them and thus can rank them higher. They also can rank their own products such as YouTube or Chrome. Another exploitation of their monopoly is that Google is the default search engine of Chrome instead of giving the user choices
There is no issue with YouTube, another monopoly, since it’s business model is driving engagement and making money from ads but not exploiting its position.
Valve is another monopoly but it doesn’t block people from putting their own launchers onto their platform. It doesn’t block you from installing another store like Apple does and in general is nowhere near as all-encompassing as Google.