Maybe in terms of the number of companies, but in terms of percentage of market size, I'm not sure. Literally the entire social media adjacent market at the moment, including instant messaging is about offering a service below cost, killing any chance of non ad supported platforms.
> And if the customers are not willing to pay more, it sounds like they're actually happy with the current offering and that's not an area that your fellow humans would find useful for you to work on.
Not necessarily. This would be true in a world of spherical cows and rational consumers, but that's never going to be the case. There's other considerations like walled garden lock-in and network effects that consumers have no control over.
> Yes, one of the responsibilities of a founder is fundraising. If you can't sell people on investing in your vision that is...a somewhat bad sign.
So it's not about "just go out and build a competitor", but something much more complex, as reality usually is. Even access to venture capital can differ by orders of magnitude between markets.