What do Tor exit nodes have to do specifically with Monero? Grin has to use Tor for network privacy too. Tx graph = following flow of funds. Monero has no amounts either and unlinkable addresses. All metadata and past transactions being erased is only true for Grin if you assume feds arent actively running their own Grin nodes and not saving it. That's a big gamble and trivial to do. If "coin mixing" sucks then not mixing at all is even worse. Besides Monero is upgrading to Full Chain Membership Proofs soon which will resolve those issues. Like I said Grin is way better at scaling just not as good for privacy in worst case scenarios.