Youtube and Android particularly are completely garbage and are not the "best" on any technical merits. To the extent they are used, it's solely because people are locked into using them by network effects. If you as a viewer use a technically superior video website, you will have no content to watch. If you as a content creator use a technically superior video website, you will have no viewers to watch your content. Similarly, if you as an OS developer want to make a new phone OS -- tough luck, nobody will produce hardware that is open and accepts anything other than an existing OS, and you can't sell a phone people will buy without modern hardware. This is why monopolies are terrible for humanity, and why Google's ongoing success has absolutely nothing to do with its technical capabilities or complete lack thereof.

>Google is still the best search engine. YouTube is still the best video site.

And both products are arguably worse than they were ten years ago.

Best in the Western hemisphere. There’s already equivalent alternatives available but it’s ok.