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Maybe I misunderstood the requirements though
You're not wrong however a lot of countries require a doctor's certificate confirming your test results. Most people call it a fit to fly certificate I think.
Most countries also require the test to be taken within 2- 3 days of travel and the testing for all one requires you to post your swab to a lab and then it takes 1 to 2 working days to be processed.
Edit: Just checked, the closest thing to a european standard is a requirement for a pcr test taken within 72 hours of your landing time. Given that testing for all need you to post the swab back to them and then take up to two working days to get the result back to you, it doesn't really feel like a service suitable for travel. The concepto guys get you your result and doctors certificate same day.
Maybe I misunderstood the requirements though