Make multiple tiers of accounts. For one offer access to special accounts that offer the users easy access to bitcoin mixers/tumblers. For a subscription fee of course. I may be able to provide the things we need to run our own mixer/tumbler.
Next tier up would be people who want access to the mixer/tumbler market. They can offer mixing services what we'd do is make sure they get to connect to the people that need those services. Basically doing the networking and aggregating plus marketing for them, for a fee of course.
On the flip side, offer accounts for people who want to be escrows. They will guarantee to the people that are exchanging goods or services between each other that everything goes fairly, they will charge a fee for that and we will charge a percentage of the fee for facilitating these parties get together expediently. Furthermore we will justify additional fees, by covering losses up to a certain amount if our escrow account holders decide to exit scam. We will manage the administrative operations of escrow accounts as well, and offer wallets on our platform for escrow accounts, and unbeknownst to them we will make sure to have access to all the funds in all the escrow account holders. This way we can intervene, when amounts over a certain threshold are trying to be moved around to different wallets that we don't control. That way an exit scam by escrow accounts will be stopped before it happens, and we will take what they owe to the people by force if need be. Say we guarantee up to 10k for anyone affected by an exit scam in progress, the other users get the benefits of that, and feel more secure doing business with our subsidiary escrows. Say a particular escrow account is holding more than they owe, we will confiscate all of it for our problems, and even if the people are owed more than 10k we contract them in such a way that we are not obligated to pay them more than the 10k, so any surplus resulting from that will go into our own accounts/wallets as well.