I don’t think you understood what I was trying to say:

The difference is that companys wont do the skippable ads by themselves. Each country will have to do their own legislation to mandate this. Even if Europe would do similiar legislation to Vietnam, YouTube would still show full ads in other countries because they make them way more money.

Which is quite the difference to hardware mandates like USB-C, where a few countries can basically set it as mandatory and the manufacturers will roll it out for all countries because its easier and cheaper to manufacture one model than multiple different versions.

It makes no sense for Apple to produce one iPhone with USB-C and one with lightning financially. But it makes a lot of sense for YouTube to show unskippable ads in every country that allows it to make more money.

Theres a major difference though. It is much more costly and complicated to manufacture different hardware for different countries (especially with the eco system of peripherals behind it) than it is to change software for different countries.

Its easy for YouTube or Facebook to set all ads for Vietnam to skippable while maintaining unskippable ads for other countries to maximize profits.

2024 was the release of iOS 17.4, when Apple allowed third party browsers to use their own engine instead of WebKit/Safari as a layer beneath. So it could very well be that Firefox Mobile and Chrome Mobile on iOS don’t get registered as iOS Device in this survey due to their user agent.