I can store my Gold at a bank, or even the deed to my house. I can deposit my stocks and transfer them in and out.
Mind you, I never said that BTC should be treated as a Currency. Most tax authorities see it as an asset anyway. Very tradable asset though ;-)
its been over a decade and a half but here is my rebuttle anaolgy based on that past experience (to get on the same level as most viewers)
i can store my sweaty shoes in a school locker. i can store .. anything in a school locker.. does not mean the school is selling me sweaty shoes or anything else. they are just providing a storage box.
you will not see a bank teller swap FIAT for sweaty shoes, baked beans or bitcoins..