Yes that’s fair enough, cash doesn’t work online - but bitcoin is a better solution for online transactions than cards.
I mean, we haven’t even got into the subject of data tracking. If you think Facebook is bad, consider for a moment how much your card provider knows about you. Banks and card companies have learned from Facebook, and data brokerage is now a trillion dollar industry - with only 8 billion people in the world (many of whom don’t use the internet or have data being traded), that means your data is worth roughly $1,000 a year. Surely, as the manufacturer of the data, you should be getting some of that?!