It's a specific kind of gambling addiction, in the same way saying someone has a 'heroin addiction' could have just been described as a 'drug addiction'. If you say someone has a gambling addiction, the mental picture is probably someone going to a casino to gamble. A 'cryptocurrency addiction' changes the mental picture to someone sitting in front of their computer watching numbers go up and down. The word refines the mental image for someone else.

But, I think it's normal to be skeptical though of new invented terms in general, since it can be used as propaganda to create fear or stigma about some very specific thing someone has an agenda of getting rid of. Cynical take: maybe someone trying to introduce the word cryptocurrency addiction has an interest in seeing the price go down, e.g. they're shorting it, etc. In the same way someone else might not want there to be stigma about crypto currencies, because they own some and want to see the price go up!