There are apps on the market that kind of do that. They are in various stages of development, but most of them aren't really going anywhere. I believe the approach is fundamentally wrong, as it focuses on the low-hanging fruit of the problem of teaching people language.
We're the only company that makes the VR a part of an existing program of instruction, with instructors. All the other apps are self-driven, which doesn't really work for the vast majority of people. We are also the only app not leaning on speech-recognition, which also doesn't really work for language training (too many false-positives and false-negatives).
I'll second this. The vocab is probably the easiest and most straightforward bit to train right now. Flash cards have already all but solved that problem as they provide the simplicity, an easily optimizable metric, and a dopamine hit from numbers going up.
The part that's harder is getting people to fluent conversations, both on the comprehension and construction side.
We're the only company that makes the VR a part of an existing program of instruction, with instructors. All the other apps are self-driven, which doesn't really work for the vast majority of people. We are also the only app not leaning on speech-recognition, which also doesn't really work for language training (too many false-positives and false-negatives).