People probably felt the same way Unity's relatively fair licensing terms, or D&D's license. They've rolled back now, but it's common for companies to push this sort of thing, roll back, and then slowly introduce the same thing.

The point is not to avoid Steam, but to keep an eye out for scummy moves because no entity operating for profit is immune to temptation. Be ready to abandon ship should the time come or you'll be the one left holding the bag.