the real risk is using it at all as you are already sending them your data. If you are ok with that, then this retention/review seems ok.
This is just a tragic moment for Tech. We just killed AI privacy. OpenAI already follows this trend and others will do too.
The only hope now is ... tada .. Mistral LOL
Consider the security angle too. You now have to rely on Anthropic’s infrastructure security. You did not previously when you used Bedrock/Vertex/etc.
The only way to really be sure is to build it from scratch starting with your own silicon wafers.
But for those who are a little more pragmatic, AWS has a good track record of fulfilling their promises.