Does Blockade prevent Facebook, Google or Instagram pixels or indexers?
No. Blockade will automatically allow all spiders, indexers or pixels to report back to Google, Facebook, Instagram or Pintrest.
Each of these services provide developers a way to identify them from other traffic. This keeps your site ranking on those services but still providing your blocking rules you set in the app.
This allowing of good services is automatic and is not configurable.
If you see some visits being allowed from countries you have blocked, open the visit details to see the reason why. You may see it's an allowed visit from a known good actor like Google.