Steam isn't a monopoly, I can get my games elsewhere (epic, gog, humble store, origin etc). But Steam is dominating the market because it does it better. It offers value and features that others don't, and it generally hasn't abused its dominant market position to squeeze the consumer or crush their competitors. The closest thing to enshittification we've seen from Steam was them allowing third party DRM and launchers, which isn't something they wanted, it's them backing down from a stand-off.

I want competition, but there's good competition and bad competition. Good competition is what we see from Steam and gog, where they stand out by being good at what they do and giving customers what they want.

For an example of bad competition, just look at streaming sites. We went from everything being on Netflix to everything being divided among dozens of shitty platforms, each of which costs more, and the prices keep going up, especially if you don't want ads. Nothing was improved for the consumer when Netflix lost its defacto monopoly. Which isn't to say that Netflix is great, only that the competition for marketshare has only made things worse for the consumer.

I think it's easy to look at all the bullshit EA and Ubisoft and the like pull now, and imagine that same pattern from streaming playing out in gaming.