IANAL, but it seems to me that to have something as a trade secret usually requires showing that the secret keeper put in significant effort to keep the thing a secret, usually there being some contract in place that defines the domain of knowledge that is considered a secret if the knowledge (i.e. models) need to be shared.

Uploading the models to an unscrupulous hosting provider where there was only some boilerplate terms of services agreed to.. would not seem to be that.