The technology is not, but trading random shitcoins is. I use cryptocurrency all the time to get around fees sending money overseas

1

Any of them can be hacked with quantum computers. Fast transfer speeds and the illusion of anonymity are gone now as well. XRP is sort of fast and may do well in the coming 10 years, but even that is hackable. Still faster to tap a card or use cash. Time is the real currency.

1