No, people use Steam and also have to install the Ubisoft launcher, the Epic store, the Paradox launcher, the EA store...
PC gaming is a good example of why the complaints about the 30% tax are overblown, but it's also a terrific example of what happens to consumers when a platform isn't able to vertically control every aspect of the distribution experience. It's not great.
I like it. I vote with my wallet and don't buy things that aren't on Steam, because I don't care enough about yet another store. Sometimes I do care enough about it, and I'll buy things from GOG, which is just the way I want it.
I want to support the companies I want to support, not the companies I'm being forced to support because I bought a piece of hardware from them.