It’s really about incentives more than morals. I know that, being in the US, if Anthropic steals my company’s trade secrets through model inputs contrary to our policy that I will (in theory) have legal standing and enforceable contracts against them. The same is not true against DeepSeek, and especially not against “Stealth”.
You can use DeepSeek’s models through a provider that doesn’t train on your data, nor retain it. You could also self host them.