Not sure but I don't think I've sold anything on expert. I've had a few move from grey to expert recently.
The one I was talking about was EVRN that went from a cuspid number and Zero value for quite awhile, to grey out of the blue and then expert awhile after that. I can say it's easy to buy at 2 usually lately. I've tried for 1s and not had much luck. Nothing may become of it, who knows, I can't find anything else new on it other than TA updates numbers periodically and never changes. I think that's automatic though.
There's a handful of greys/experts I keep an eye on. and I have a few cuspid numbers I would love to see turn up grey or expert like evrn did! I was shocked when that happened.
VONI is an interesting one you mentioned and I'll keep an eye on.
It sounds like this is a very fluid situation with otcmarkets and things will continue to evolve.
Just today I noticed that there's a new tag of "unable to contact" that I've not seen before (listed next to c/e, shell, pink, etc).
Fortunately none I own have it but that's a bad omen imo and maybe will proceed delisting of those.
This is an interesting board, thanks for creating!