Ok. Silly quips aside, bike chains do actually last 5000 miles, not 500, if you keep them relatively clean. That's a lot better than 1500 miles or kilometers.
If this rope works well and is easy to replace, and is inexpensive I think I would be fine with changing it every 300 to 1,000 miles or so. They have it listed that you can change colors to match your outfit, so I am expecting it to be that easy.
> Change the strings quickly and easily in 2 minutes, no tool required and no need to remove the wheel. Choose the color to match your outfit or mood.
They say a few minutes, but with a lockring tool and a chain with a masterlink, I bet someone with a bit of experience could change a cassette in under 2 minutes as well. The rest of the mechanism seems a lot less durable and a lot less amenable to off-road riding where one might wish to pedal backward up to a full revolution to reposition their feet without wishing to propel the bike forward. It might be OK for casual / commuter bikes, but belt drives already exist and last a long time. The width of the rear axle required for the dual-sided drive also looks super goofy and probably gives a poor Q factor ( https://www.cyclingnews.com/features/what-is-q-factor-and-do... ). Overall these seem like a lot of compromises for little benefit beyond a chain or belt. Chain-driven bicycles are also incredibly robust and proven to work amazingly well in a very wide range of conditions, and are serviceable worldwide.
