Trusting users is a good way to stay connected with buyers/sellers that you've had good experiences with. Their offers will then be prioritized on the offer page. Blocking users is a good way to stay away from buyers/sellers you’ve had bad experiences with. If you’re selling cryptocurrency, your offers won’t be shown to them. If you’re buying cryptocurrency, you won’t be able to see their offers.
Note:
If you block a user, they won’t be able to contact you via Messenger.