He means it doesn’t make sense for the startup. The comment you’re replying to, is arguing that this point from the gp is a disadvantage instead of an advantage:
Not OP, but I think their point was the corollary of that.
Yes, obviously bad use of a good tool is dangerous. But correct use of a malfunctioning tool is also dangerous.
Millions of people understand when they get in their car that there’s a tiny chance the car will crash/explode that day through no fault of the driver. Most do not have the knowledge and competence (or even the time) to thoroughly check the engine every day to guarantee that that won’t happen. They get in anyway.
It’s not the same. Presumably public domain works are much more frequently shared on the public internet and therefore much more common in the training set