Will Customs perform fewer inspections because of the port solution?

Customs performs risk-based inspections. As part of this, it also verifies whether the correct formalities have been completed (e.g. the presence of an export declaration, otherwise the shipment is prohibited from leaving).
The solution will consequently not lead to a reduction in the number of inspections. The starting point of Dutch Customs is smart supervision with minimum disruption to the logistics chain, under the assumption that all formalities have been completed. The process that has been automated in the ports via Get Ready for Brexit makes this possible.

Do all ferry companies use the Portbase solution?

Yes, Portbase is working on a solution for Stena Line (Hook of Holland, Europoort), CldN (Rotterdam), DFDS (Vlaardingen and IJmuiden) and P&O Ferries (Europoort).