I’ve had SSSS on my boarding pass multiple times when flying to the US. At Stockholm and Copenhagen they will take you out of line at the extra check at the gat

I’ve had SSSS on my boarding pass multiple times when flying to the US. At Stockholm and Copenhagen they will take you out of line at the extra check at the gate (post security), to do another GC check of your luggage. Swedish airport security typically would also take my passport away until after the check. Amsterdam has a central area for this with Delta, after which they tell you the real gate (which is not on the monitors). United is again at the gate. Also: on days that I would get SSSS’d, mobile and self-service check-in would not work, forcing me to get the pass at the counter. Flights not to the US, even if outside the EU don’t have these checks. Honestly, If I would have something to hide, the SSSS on my pass would give me ample warning to just leave the airport again. Wondering if I can ask ‘why’ using a GDPR request now