With the lack of major businesses and businessmen claiming to be using Bitcoin regularly for transfer, I doubt that its use for transfer or any other perceived use case is in the billions.
Estimates of $ denominated daily transaction volumes literally are in the billions range, since 2017 at least. This cannot be all people sending money to themselves, some significant proportion will be commerce.
Of course there will be in future, and there is right now but only for people who are already mired in the cult. I wouldn't class that as real world.
It's obvious many people do value it, but that value is based largely, or not too far off entirely, on a future that hasn't arrived yet.
This is the solipsistic point of view, "I don't see it, therefore it's not happening". You've only got to look at this forum to see real Bitcoin commerce taking place, or go to a country like Czech Republic, where there is considerable anxiety about having a local currency that goes through alarming drops in the FX market; subsequently, Bitcoin is probably more used in Czech Republic than anywhere.
Defeat your lack of imagination with this thought experiment: the world exists beyond your everyday experiences! Amazing, isn't it!
