Much electronic ink has been spilled on this topic. Any country not subject to CITES doesn't care. The Europeans that are subject to CITES have essentially decided that anything produced in vitro regardless of its origin is essentially OK. Whether this is specifically true by law in all countries, I don't know, but it is the way it is being enforced for the most part. As stated above, the US has historically taken the more militant position that if a species was never validly exported from it's country of origin, then any subsequent in vitro derived plants are still considered improperly imported and subject to CITES enforcement. The gray area is that crosses are not part of CITES, so a hybrid cross with an "illegal" plant can be imported. This is also why you see dubious claims of plant distributions of species to include China or Thailand for plants that have not been legally exported from adjacent countries.
US fish and wildlife has done some crazy things over the years enforcing CITES - see anything about Phrag kovachii, Paph vienamense or
George Norris. They seem to have recognized that this degree of over zealousness has not really been a good use of resources and "spectacular busts" of orchid smugglers have been few and far between in the last 10 years. That being said, if you came into possession of
rungsuriyanum that you were sure had no impact on wild plants (so you feel morally OK with it), you still couldn't show such a plant at a US orchid show, and it would be unwise to tell others about it lest USF&W decide to change their posture back to a more aggressive stance.
I think this is more of a personal evaluation. I think we can all agree that a small number of plants taken from the wild and quickly artificially propagated is the best way to remove the incentive to further extirpate the species from the wild. The question then becomes, does one follow a largely ineffective and counter productive law, because it is still the law or ignore it and take the risk of consequence for doing so.
Buying collected rare plants that puts pressure on wild populations without proper export is a whole other thing that I think most of us would agree is on the wrong side of the line.
Not intersted in a debate - just clarifying why people in various regions of the world may have different perspectives and risks they are or aren't taking by owning a plant like Paph
rungsuriyanum.