14 million pays for a couple salaries and a few server bills. That burns away fast when users get higher and higher into the tens of millions.

Being mission driven and not getting distracted is nice, but that doesn't put money in their pockets. Firefox and other products that are/were beloved by similar crowd have been asking for donations for years and it hasn't worked out. Wikipedia seems like the rare exception that pulls it off, and that's because they're aggressive with their campaigning for cash and they're basically an indispensable public service at this point.