I think you’re looking for an answer you’re not going to get unfortunately. I think there actually is a higher than average risk of data leakage with the insane optimizations that go into model serving - GLM5.1 had an issue of going into jibberish when their infra was under high load, and it turned out to be a cross-request KV cache contamination issue.[1]
Personally, my effort has been to use local models only as of late, and it’s gone pretty well!