Given that betting on baseball is the one unforgivable sin in baseball, I expect that MLB will take a very close and fair look at this.
The only way Ohtani should be fully cleared is if he really did know nothing about his interpreter and close friend gambling. It might be a little gray as isn't Ohtani gambling, but
If they find something along the lines of the interpreter telling Ohtani something like I've got 10K riding on you this game, there should be mulit-year suspension if not a lifetime ban. If Ohtani said he'd cover him if they lost, then it should be a lifetime ban, no question.