The exchanges are obviously working with blockchain analysis companies such as Chainanalysis but the data flow direction is from the analyzer to exchanges not the other way around. Basically exchanges are using these blockchain analysis companies to do things such as blocking their users who deposit the so called "tainted" coins in their platform. @dkbit98 should clarify if it is otherwise.
It's two way street really.
How do you expect Chainanalysis and other similar blockchain analysis companies are getting all their information from, it's surely not from thing air or from regular customers.
They have software and algorithms that are reporting back addresses from all exchanges, including information they are getting from government agencies, and since that software is closed source, we can't know exactly what they are doing.
The exchanges also won't hand out information to any of these companies without a court order. Some shady exchanges desperate for money could be illegally selling users data though but that is a different topic.
Not exactly true.
I remember Binance giving customer information to government of Netherland without any court order, and they even froze accounts for some of their customers who are not Dutch citizens and they don't have any connection with that country.
For me Binance is shady exchange, but most people consider it one of the best exchanges in the world, even if they already had big leak of all customer data information.
I don't believe a single big company (or government parasites) to keep our information safe and secure.
This is just my own opinion and I could be wrong of course.