Do they need to put some funds in escrow? Or will they just shut down the entire company and let the players sue for it. (I know that big publishers won't do that, but I'm sure the lawyers could create shell corporations to solve that problem.)
Or they could just demonstrate that they have an offline play capability right from the moment they sell it.
Just make the punishment the seizure and full release of the game assets (all source code, version control history, tooling, and release of copyright/trademarks).
It's always going to be a wild goose chase trying to take money when there isn't any (actually or by design), just take the product and let the public update it as a last resort.
It doesn't really matter how they comply, so long as the punishment for bon-compliance is serious enough to motivate a good-faith attempt. I'm wary of jumping right into encoding specifics into legislation. That said, I'll be surprised if this actually has the necessary teeth.
Step 1: Open LLC dedicated to this specific video game title.
The entertainment industry has a long history of making successful movies appear unprofitable on paper to avoid paying royalties.
https://en.wikipedia.org/wiki/Hollywood_accounting