To be clear, I was only quoting RxJS as the most popular implementation in js for the Observable primitive. This has nothing to do with the Observable primitive. My complaint isn’t that this steals SEO, it’s that this becomes less searchable because any search for “Observable JavaScript” is going to turn up RxJS/MobX or one of the other libraries that implement Observable primitive types.

Edit: with regard to ReactiveX...well yeah. But it’s nice that it’s implemented in so many languages! (Not just RxJS) http://reactivex.io/languages.html