I propose the following data to be a new case:
|Name||A proprietary cryptocurrency must be bought to do transactions.|
|Description||Because this service uses its own cryptocurrency, administrators may be able to set the sell/buy prices arbitrarily, and even halt the buying/purchasing of the cryptocurreny altogether.|
|Topic||Topic Payments (ToS;DR Phoenix)|
I gave this case a similar weight as Case 497: Prices and fees may be changed at any time, without notice to you because it has a very similar impact, except this one is retroactive. Though it should be mentioned that on the example, the condition only applies to companies, not researchers.