In what sense do you mean “open source”?
Its really not that clear of a distinctions as it used to be.
Do you have an example of this happening short of blatant asset flips?
The biggest issue I have with the indie scene is that so many of them are solid base engines or aesthetics with a general confusion of what to do after that, and end up with something fairly mediocre — which could be fixed with fairly minor changes. But there’s a very limited appreciation for modding, and even less for open source, so they die in irrelevance.
Where are you finding all these open source games?