Do you plan to sue the provider of your “open source” model? If so, would the goal be to force the provider to be in full compliance with the license (access to their source code and training set)? Would the goal be to force them to change the license to something they comply with?
You would be obligated, if your goal were to be complying with the spirit and description of open source (and sleeping well at night, in my opinion).
Do you have the source code and full data set used to train the “open source” model you’re referring to?
I mean you would be legally obligated. You can sue someone who uses the GPL and doesn’t provide their sources.
Do you plan to sue the provider of your “open source” model? If so, would the goal be to force the provider to be in full compliance with the license (access to their source code and training set)? Would the goal be to force them to change the license to something they comply with?