This provides examples of phenomena that are very similar to other phenomena known to possess particular properties, and argues you don't need new evidence to deduce that there is a significant chance that the example phenomena share the same properties as the similar phenomena.
This is not congruent with the gift card example. There is no comparable product that is known to be used in the majority of cases for money laundering.
The fact is, there is no actual evidence of this extreme prevalence of crime within the crypto space that you allege.