Suggestion: reputation system 
there could be a reputation system: 
-number of completed trades (ex:1000
-score of won arbitrations ( if -10 it means he lost 10 disputes, if +10 it means he won 10 disuputes) (ex:-3)
-number of completed trades with you (ex:0)

user: bob (1000 / -3 / 0) wouldnt seem trustworthy as he has many trades but lost disputes
user: alice (1000 / +10 / 0) would be more trustworthy as she won disputes

I think this could add up to the incentive to not scam (like it was on localmonero, if you fail a trade, you no longer have a clean 100% record), let me know your thoughts if this is a good idea or not

it could also be optional, as its potentially easy to give yourself a ton of positive reputation points

EDIT: so If there is a reputation system later down the road (because i think we should first focus on the payments methods documentation + trade protocols), it should be:

-as hard/costly to manipulate as possible (where bob spins up 20 haveno dex instances to trade with himself kind of example)

-easy as possible to loose everything in one scam attempt (1 failed transaction) = need to start the grind all over again