A better metric would be view minutes. YT content length is very different. Also YT has substantially more drop offs than tiktok - it is lot harder to drop off

A better metric would be view minutes. YT content length is very different. Also YT has substantially more drop offs than tiktok - it is lot harder to drop off in 15seconds . Even if these were all equal bottom line is advertisers need to make money, i.e. how many people click on the ads and buy the product, some platforms just fundamentally have different demographics , App Store makes more money than Play Store for example, ads will be priced according to that.