[mirzap]

One. Continue. For each you mention, I can think of 10 other well-known web apps that don't use them. 90% of the web doesn't use those 2. That's the fact.

[bdangubic]

One.

You asked for one via Which web app or startup uses them? :)

Also, 90% of the web are either cat memes and stupidly insane things like social media and video streaming shit platforms