[solardev]

I don't think this is completely unheard of, FWIW. For a few years, one of the big banks (maybe BofA? can't remember for sure) was actually doing this (rendering text as images) for account numbers, not balances.

Personally I found it quite annoying, both because (philosophically) it's just security theater that doesn't actually protect anything, and (pragmatically), like the other poster said, it made copying & pasting more difficult. It also broke page zoom (I'm old and need to enlarge all the fonts to read). But such a feature did exist.