Hey @openea.eth, thanks for your answer! Basically, we are already on Metamask so users can easily buy crypto with fiat there.
The purpose of my message was to make ENS more accessible to all.
As of now someone interested to get a domain.eth has to go through many steps before being able to own one (bank → CEX → conversion → Metamask), it could be simplified by having a fiat on-ramp directly on the app.ens.domains 
What are your thoughts on this?