neither has any plans to accept the other's NFTs.

However, NFTs that are accepted by both will have higher value.

but the game itself doesn't care.

We are starting seeing this on Roblox and Fortnite where skins can pass through to different games. .

As soon as either company crashes and goes bankrupt, everything connected will become useless and lose most or all value. Thus, blockchain wouldn't fix the issue.

That's exactly what blockchain is fixing. E.g. Your valuable skins don't disappear when the company running the game you play goes bankrupt.

That's the theory. Games companies are at the private blockchain stage but there are some small web3 game developers.