Heck, technically all games have that risk of if the developer will keep it updated. But obviously on the gaming side, things are pretty well established. Reputations are known quantities, and the legal side of it has been explored. Even still though, there are still releases that come out in a questionable state.
Early Access has been a bit 'riskier', take that spacebase example. Doublefine has been pretty trustworthy with actual releases, but has caused some trouble on the early access side of things.
Continuing along, paid mods would probably have been 'riskier', as none of them would have a history or reputation in a paid ecosystem. But obviously they can't build up that reputation without a paid ecosystem,
The whole 'Will mods be properly supported' argument is a good reason to show caution when paid mods arrive. But it's not a good reason to argue against paid mods in the first place because it's a chicken or the egg thing at that point.
I think you underestimate what modders are capable of, and besides, the complexity of mods can vary wildly. The amount of support necessary isn't going to be consistent enough for this to apply to everything.
