These subscriptions explicitly do not suck in your proprietary data, it's all laid out in their ToS.
It's in their interest to do right by their customers data, otherwise there will be a heap of legal troubles and major reputation hit, both impact bottom line more than training on your data. They can and do in fact make more money by offering to train dedicated models for your company on your data.without bringing that back to their own models.
In unrelated matters, I have a bridge to sell you, if you are interested.