2000BTC isn't very much at all, especially since the mixer having 2000BTC doesn't mean they can securely mix 2000BTC.
Exchanges will most definitely be storing logs, so that won't help much.
Comparing mixers to relays isn't valid either, with BTC the attacker will have access to the blockchain, which is basically the worst possible attack scenario for Tor.
And in any case, there isn't enough BTC transaction volume to reliably hide large amounts of BTC.
Exchanges will most definitely be storing logs, so that won't help much.
Comparing mixers to relays isn't valid either, with BTC the attacker will have access to the blockchain, which is basically the worst possible attack scenario for Tor.
And in any case, there isn't enough BTC transaction volume to reliably hide large amounts of BTC.