We don't really know the nature of these distribution agreements, so maybe the devs can't really decide how and where their games are being sold. Personally I would be fairly pissed at the low effort that's being displayed here, because it doesn't really speak highly about the amount of care those distributors put into the products they represent.
However I don't think that this neccessarily a big problem, as is when some folks are just selling Steam Keys of their games. Where I start to feel uneasy about, is when the work of bigger publishers gets frontpage features. For example a few months ago DoubleFine put a bunch of their older stuff on itchio and it took a lot of space from other smaller titles. I get that it's important for itch to point out that larger companies are coming over and that the platform itself is growing. But I don't think that featuring games that don't really need the extra attention, are supposed to represent what makes the platform what it is.
This all isn't really big deal to me, at least not right now. These problems are part of what happens when an open platform grows and it's important to adress them properly, before they might get out of hand.