Ads have arrived in Color OS also, Received an update yesterday on Realme C1 which apparently claimed to fix some bugs.
After updating Realme apps were installed, one of which was Realme Store. That Realme Store added 2 folders on home screen for showing ads of apps. What's worst is that You cannot uninstall that app or remove those Ad folders.
Same Ads are added in Smart assistant also. I think this is just beginning they will follow Redmi here also and show ads at lots of places.