The vast majority of people don't care about TCP/IP either, but still use Facebook. (Blockchains are similarly low-level infrastructure, that enable all kinds of higher-level user applications.)
If I am reading you correctly, I disagre. I suspect you couldn't even find two billion people who care if the source is open.
I love FOSS. I donate to EFF. I have met people who are heavily involved. I am in the minority.
If people were going to care about it being open source, the computer realm would probably much different. People just don't care, and it's not like we've been shy about telling folks about its benefits.
Most folks are happy enough with their closed source. No evidence suggests that this is going to change. FOSS has been more than adequate, for most users, for a long time.
There is no evidence that this year will be the year of Linux on the desktop, for example.
