The nightmare for Anthropic to be caught doing that combined with the temptation of their staff to virtue-signal by blowing the whistle...
I trust them to act in their own interest if nothing else.
And what if they use your data tò generate syntethic data to train on?
Aren't they on the "we, the safe AI, must win at any cost" justifiers?
What's a little contract violation if the fate of humanity is at stake?