I have not seen similar projects in the industry of decentralized games, so there is no way to learn from experience and mistakes. Perhaps there were attempts to implement something like that, but it did not come to the implementation of the finished product. The STONE developer will have to independently test the platform and fix bugs that he will encounter.
There are special people for testing, or they can release the beta version and give everyone the opportunity to test it, as other developers do. I hope that in addition to Ethereum, the EOS, NEO, Stellar and Tron protocols will be integrated into this platform.