If they’re one-time use, how does that work with accounts that require that number to stay attached to your account and use it as two-factor authentication?
You get the exact same quality at around ~25% smaller than other image formats. Unfortunate that it’s not supported by everything, but yeah it’s a better image format practically in that sense.
On the web this saves money when storing at a large scale, and it can have a significant impact on page speed when loading websites on slower connections.