Assume XMR.to has the transaction data for a very large number of Monero transactions. For each of these they know the real inputs and outputs. Could they use this data to do chainanalysis and deanonymize Monero?
What if all the instant exchanges doing BTC to XMR and XMR to BTC transactions shared their data with chainanalysis companies? Those probably make up a significant percentage if not a large majority of transactions since BTC is how most people onramp and offramp. Would having that many real transactions help identify which other transactions are decoys?