> Yeah but the open source ones ARE guaranteed. Even if they later become closed source, the code up till that point will remain open source forever.

The changes from the Apache 2.0 license are sufficiently minimal that you can _still_ fork it from that point, you just (a) won't be able to use the trademark (b) won't be able to sell it.

Given the clearly stated goals of the foundation and hence the project, that seems to be providing exactly the guarantees they intend to provide, and while your point about assurances is entirely fair, I think you're underestimating the level of legal guarantees that you do get here.