It isn't a high profile game. You may have gotten the impression that it was because of the drama that Kuro got involved in, but from the start it wasn't intended to be some major project.
Over in CN there was never any major marketing push for it. When TW released there was no marketing push for it either, and to this day the social events that happen on TW are basically small fan events, which some Taiwanese think are probably being held by fans (doesn't help that they pitch discord activities). JP launched with little to no fanfare outside of the community who was already aware of its existence.
Kuro, from day one, has seemingly not given a shit whether the game is successful money wise or not. This is in line with their previous game, Twintails, because that game had even worse marketing and an even smaller playerbase.
PGR came out during what the Chinese market saw as a "sci fi boom". Basically every developer seemed to be making a sci fi game for whatever reason. Some of them didn't make it, others became moderately successful, but for the most part, the ones leftover like PGR have settled into a holding pattern. The difference in the Chinese and the Western market is that companies will often maintain holding pattern for years, and they don't seem to have any stakeholders to answer to when it comes to demonstrating massive growth.
Speculation is that many of these companies are either subsidized by the state, or they have larger backers who will float them as long as they stay in the stable, but the exact details are unknown.