https://www.youtube.com/watch?v=mKCVol2iWcc
There are ~487k fast food cooks employed at ~$22.6k average wages. That's more than an $11 billion annual incentive to bring robochefs to retail. And that's just fast food, just in the US.
Robo janitors may take a bit longer. Maybe they can design automated kitchens that work like jumbo dish washers. Seal, flood, heat, drain, reopen. The janitors could take the form of underwater scrubbing drones.
Put the kitchen in a shipping container that plugs into the restaurant. When it breaks swap it out for a refurbished one and haul it back to the repair center. With a self-driving truck.
Let customers watch their order being prepared on their phone, micromanaging the bot with special requests.