I think the genie is out of the bottle on this one and there's really no putting it back.

There is a certain amount of brand loyalty and platform inertia that will keep people. Also, as you point out, just having the source code isn't enough. Running a platform is more than that. But that gap will narrow with time.

The broader issue here is that there are people in tech who don't realize that AI is coming for their jobs (and companies) too. I hope people in this position can maybe understand the overall societal issues for other people seeing their industries "disrupted" (ie destroyed) by AI.