More popular the service is more difficult to make breaking changes . YouTube has a wide install base on variety of hardware like older TVs, most of it with no

More popular the service is more difficult to make breaking changes . YouTube has a wide install base on variety of hardware like older TVs, most of it with no path for upgrades . That means it will take many years if a not decade or more for YouTube to implement new protocols and drop old ones without it causing problems to significant user base . If the user base that hacks around ads is < user base that will loose access by implementing something like above , economically it makes sense not to do so.