Mainly because of fees. I'd say crypto (as a whole) has had a huge increase in acceptance overall, and with Bitcoin being the easiest to purchase and usually the favored currency to trade alts with, it's natural that it's only grown in popularity.
Note the actual comment I'm responding to:
> The more people that are willing to accept Bitcoin in exchange for goods and services, the more valuable Bitcoin is.
Approximately nobody accepts Bitcoin in exchange for goods and services except to buy drugs. Which does count as a use case, but it's a trivial one compared to the speculation; and even drug buyers and sellers are endlessly frustrated by the transaction clogs.