Take Hollywood, for example: few things nowadays are as ever-present as motion pictures, but the total box office revenue for 2016 was around $11bn [1]. That's about 19 days worth of revenue for Apple, going by their last quarter [2].
Just because you see it everywhere, or everyone talks about it, doesn't necessarily mean that it's a huge moneymaker.
[1] http://www.hollywoodreporter.com/news/2016-box-office-record...
[2] https://www.apple.com/newsroom/2017/05/apple-reports-second-...
Seriously though, I think you're being totally unreasonable. :) $11 billion is huge revenue for movies. That's not chump change.
¹ https://www.forbes.com/sites/laurengensler/2016/05/26/global...
Twitter might be ubiquitous (a household name, as you said), but just like Iron Man, its popularity is not proportional to its financial success.
For anyone wondering why parent uses "undone", "could have been much bigger", at a time that Twitter is a household name, the President tweets, people hold public conversations over Twitter, and list Twitter handles instead of their emails.[1]
It's because Twitter is "only" an $11.9 billion company by market cap, whereas Facebook is at $492B or 44 times bigger. I can't think of any other metric by which Twitter isn't a resounding success story.
[1] https://levels.io/hoodmaps/ - Very bottom "I don't use email so tweet me your questions."