There is a certain hypocrisy in anybody claiming to care about digital ownership and simultaneously having monetarily supported valve and using their platform for years.
When Steam was in its infancy, a great many computer gamers at the time—perhaps even a majority of them—vehemently opposed what it represented, but were ultimately powerless to prevent it. The same people were similarly vehemently opposed to the introduction of microtransaction shops, gambling schemes, abusive DLC shenanigans, pre-order coercion schemes, et cetera.
I personally believe that this opposition had some limited effect, but only managed to slow the decline for at most a few years.
In order to avoid the hypocrisy you speak of, you pretty much would need to have stopped playing computer games entirely a long time ago. I guarantee, for example, that even if you're a Steam boycotter who's never strayed, you've purchased games from and therefore supported companies who sell most copies of their games on Steam—thereby supporting Steam. No matter how indirectly, supporting companies that distribute via Steam means you're supporting Steam and its monopoly.