[alt text: a screenshot of a tweet by @salgentile on Twitter, posted on 08/06/24. The tweet says, "Tim Walz will expand free school lunches, raise the minimum wage, make it easier to unionize, fix your carborator, replace the old wiring in your basement, spray that wasp's nest under the deck, install a new spring for your garage door, and put a new chain on your lawnmower".]
The drivetrain to the driving wheels (usually rear) can still be with a chain.
I honestly haven't seen one in >30 years with a chain. Admittedly, I haven't been looking too hard.
I haven't haven't worked with those either, just saying that it COULD make sense to have chain drive there