I noticed that for some time there is a message posted on the Premiumize website regarding payment options that Crypto is currently unavailable but, that they are working on it. I emailed them and asked if and when it would become available and this is the reply I received:
We currently accept payments in cryptocurrencies in all countries worldwide, with the exception of the United States.
We are working on this with the highest priority in the United States, but due to tax requirements, we are currently dependent on instructions and approvals from the relevant authorities. For this reason, we are not yet able to provide a reliable timeline.
We apologise for any inconvenience.
Best regards,
Premiumize.me Customer Service