Yes, there is a threshold not to be exceeded on the Shopopop app: if you reach a total amount of earnings greater than or equal to €3,000 over a year (since January 1 of the current year), it will then not be no longer possible to reserve new deliveries on the Shopopop app.
And don't forget: Shopopop is above all a collaborative adventure! A great way to make ends meet (occasionally) while helping out.