This may have changed, but in the past, I believe they were essentially just rebranded Xiaomi cameras (possibly from other suppliers) with different firmware. I originally thought the Chinese products were clones of Wyze, but it appears Wyze is actually just using existing low-cost hardware from overseas. Happy to be corrected if I'm wrong though.
FYI - for some camera models (Xiaomi or Wyze), you can flash them with this custom firmware[1], allowing for a lot more customization.