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Would be a shame if their data centers were seized if they wouldn’t comply...> (I’m not sure if German courts use this technique, but it’s commonly used by US courts to force German companies to adhere to US laws, like in the many "Germans can’t sell Cuban cigarettes to Danes in Germany due to US embargo of Cuba" cases, so precedent exists.)
Could happen, but not easily. If they got sued, lost and had to pay, ignored that as well, then a gerichtsvollzieher would try to force giving over existing assets. In the most extreme cases that would include a data center, it happened for example that they tired to size an airplane when an airline did not pay a (comparably small) fee.
Of course it won't happen as no one will sue (I could've, but had way too small an amount in credits and asked for a prolongation of the deadline instead), and I'm sure DO would react in such a case.
Still: To have promotional credits run out after some time is not customer friendly, and this discussion shows that the dollars they save pales in comparison to the amount of goodwill and thus business they lose. I told them so.