Fortunately no 6€ handling fee for sellers using IOSS, like AliExpress.

I guess it depends on the household size. I have a 50m² apartment. I only need to empty the dust bin after maybe 5 full cleaning runs.
I created an automation that tracks the total area cleaned and it will move the robot vacuum to the trash after 200m² cleaned. So I don’t have to remember to take out the trash :)