No. Stop. Why would you alter users thumbnails? If they wanted their thumbnails to look different they would do it themselves. You are now directly altering people’s content. This should not be happening.https://twitter.com/TeamYouTube/status/1176678442055675905 …
Any feature that alters the content should be optional so that those who like it can use it and others can opt out of present their content how they chose to make it look. @YouTube and @TeamYouTube please be more mindful of these basics