There have been several, way back when Alibaba when it was on pink sheets, when Yahoo had also had an investment, made a small fortune, then after they moved Alipay out & went temporarily private, I was already out, another that I can remember DRUS Drone USA or whatever made a lot, in low & out high, EDXC I think was the weed company fell into expert market temporarily had buy orders in the triple 0s, then back on pink sold, so many, in & out, some losses too obviously, just part of trading. But the huge wins in OTCs have overall outweighed the gambles by a lot.
I mostly day trade, mostly options, calls & puts, following the flow, market sentiment, technical analysis. All investing, trading is gambling to different degrees. But expert market is total lottery plays, boom or bust.
But optimistic for $KWBT if they get trading again, hopefully soon. And really depends on ones entry point & exit.
Bullish