I've never seen this, but it sounds wonderful! Is it back painted? I've seen kitchen backsplashes that use back painted glass in place of tiles and it's gorgeous. Do a Houzz search and you'll find lots of examples.

All that I have seen on Houzz are either painted or frosted, but this is a different process. I have never seen a shower done. Houzz has nothing like it as far as I can tell.

The only challenges I can envision is to get a complete seal - you wouldn't want the glass to create trapped moisture on the wall behind - cement board behind should deal with that aspect once you have good overlap / water closure in the corners . . . Also, to meet code, you need tempered glass.

Candice Olsen did a few backpainted glass walls in some showers on her shows years back. But just one, with tile closing over it at the corners . . If you address the practical elements, there is no reason not to - easier to keep glass clean in a shower than most.