I can’t speak with confidence about the legal situation in other countries, but in the US frivolous lawsuits are routinely punished by having the plaintiff cover the defendant’s legal costs plus compensation for their trouble. Avoiding liability in general is still best practice, but there’s no significant risk of liability from actions taken by a customer in the dining area, customers are supposed to be there and nobody could reasonably expect the restaurant owner/management to predict and/or control the behavior of all of their customers. The customer would be held responsible for their actions and would be on the hook for any damages.
Sega GameGear. That thing had a better screen than any portable gaming device would for another 20+ years, but it would eat 6 AA batteries in less than an hour. There were rechargable battery packs you could get for it but they were heavy as shit and didn’t last noticeably longer, you could play it with the battery pack plugged into the charger but then you’re not actually mobile at all so you might as well play the same games on the Genesis.