In the same way that if the government is tracking our private conversations to detect human traffickers then it's broadly ethical and reasonable from an ethical perspective?

Can you explain how the privacy violation of tracking mouse movements on a subset of online markets is similar in scope or substance to tracking all conversation?

I see a number of obvious differences: I can opt out of purchasing from stripe-managed sites, while I cannot opt out of dragnet government monitoring. I can imagine less invasive ways of stopping human trafficking, while I cannot for fraud prevention, etc.