No, you do not have to deposit euro every week. The limit is a maximum that you can deposit per week and does not oblige you to deposit every week.
It's entirely up to you when you deposit euro.

Frequently Asked Questions (FAQ)
Subjects
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Do I have to deposit euro every week?
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How do I increase my weekly limit?
You can increase your limit by going to "Account details" and clicking on "View verification".
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Contact usFive frequently asked questions
Here you'll see five of the most commonly asked questions