@D.H. can you clarify the following question:

Assume your business sells 2 BTC to me for 1000€ and that the VAT rate is 20%. Furthermore, you charge a transaction fee of 10€. Do I need to actually pay

(a) 1010€, consisting of 1000€ + 10€ fee
(b) 1012€, consisting of 1000€ + 10€ fee + 2€ VAT on fee
(c) 1212€, consisting of 1000€ + 10€ fee + 202€ VAT on everything

What most seem to fear is case (c), which would indeed be catastrophic. I don't understand the legalese of the English question, but the German translation of the question to the court only asks about case (b).

So is the question only about whether (a) or (b) applies?

Edit: after reading it again, it seems even more subtle: the German version asks whether case (c) applies in cases where the exchange adds an implicit fee to the exchange rate. I.e. the real exchange rate is 1:500, but the exchange is giving you 1:505, thereby embedding the fee in the exchange rate. Of course, there is a chance that the court will go further and also hint at the answers to other questions. But the question itself seems to be very narrow and specific.