As a buyer I would never want to use cryptocurrencies. There is absolutely zero customer protection without the cryptocurrencies going trough a middleman, at which point it's nothing else than another version of PayPal.

This is the primary reason I, and I assume a lot of others, use PayPal - not because of their amazing customer support, but because of their customer protection which works just fine in 99.9% cases - which is still a lot better than 0 customer protection.