Afaik never (or at least not with the current versions) because HBM has to be directly connected to the GPU or CPU die via an interposer, it’s not something you can slot into a mainboard.

Tbh the issue is price, newer cards are both quite a bit more powerful and power efficient. Went from 1080 to 3070 ti and now 5070 ti and each upgrade was a significant step up. Going straight from 1080 to my current card would be an insane jump. BTW this is based on performance I’ve seen in games, not benchmarks.