" it's users being forced into walled gardens as closed systems added support for open systems, but open systems could not reciprocate, and the market adjusted."
We haven't seen users forced to do much of anything. In general, there's multiple ways of achieving their goals. They almost always pick either a proprietary company that likes lock-in or a free, ad-driven solution that sells them out. They neither take time to understand the consequences of that ahead of time nor cared enough to switch in the years I've explained it to hundreds (thousands?) of them. Very, very few would switch. And for social media, it's usually a network effect they're joining where stadiums worth of people would have to switch at once or close together to avoid chicken-and-egg problem. They could collectively use open standards to communicate like open-source IM and buddy lists but most don't given they'll sacrifice control of their data and privacy for convenience.
There is a market effect like you describe where the suppliers benefit from lock-in. That's been steady a long time with even the open standards often intended to catch new customers in lock-in in other ways. On the demand side, though, the masses haven't used open-source as a factor in their purchasing much at all. So, it's not even a differentiator on their end for most suppliers to target. The market didn't even adjust: it defaulted on lock-in strategies for owners' benefit with companies occasionally experimenting with other methods they sometimes reversed.