They also have some sale coming up where you get more storage or extra cores for the same price: https://www.netcup.com/en/deals/easter-sale Usually these apply permanently.

4x10 is tough, I don’t wanna imagine doing 4x32… scnr

That might have been an even „simpler“ test.

Find some loophole in their T&C to terminate your account I guess. Similar to how mobile providers don’t like people actually using a lot of bandwidth on their „unlimited“ plans.