these last three are open source according to the osi definition, meaning you can get access to their training data and train them yourself if you have enough money and technical knowledge.
This is usually a big green flag that the model has not been trained on copyrighted or otherwise unconscenting data, because people would be able to tell much, much more easily, as you can just do a simple search in the publicly available datasets, as well as compare the final performance of a model you trained yourself that there is no unknown extra data involved.

As of yet i do not know any diffusion model trained this way (sadly), so i just have to trust that freepik did not lie about training F-lite solely on data they own