For Megascans their terms for the Hobby License is that any content that you use your points for with that subscription can’t be used commercially. If you decide later on that you want to sell stuff then you need to pay for one of the higher tiers and spend points on the content again that you want to use commercially.
For other software it’s not so straightforward and you just need to have a commercial license at the time of release. Not all software is subscription based either.