I understand your pain on this because i've been there. At the same time, deep down, I think many of us have also learned the truth:
If there is some startup providing some ridiculously awesome service and strangly isnt charging:
1. It will charge in the future, and even that charge may not be sufficient to cover costs (see: Quantopian recently, apparently could not find a price point which kept users and also kept the service)
2. It may get acquired, to finance long-term profitability (see: YouTube, WhatsApp, Instagram)
3. You may be giving up more than you thought you were (e.g., privacy) (see: like half the social media startups)
4. It may get acquihired, and often the product is sunset (see: Slide, Parse)
5. It may shut down (see: like 95% of your friends startups)
As a former founder, I can say most startups are just one funding round away from case 5 (bankruptcy) -- see MapR. In which case, sometimes you accept case 4 (acquihire) as a consolation prize. Many of us want to be the next FAANG, but reality strikes that obviously not all 100,000 startups out there will become a fang. Often, you teeter in case 1 (barely making it), and if that happens too long, you might go with option 2 (strategic acquisition.)
There are a lot of problems as a founder. Not all of them are actually about tech. I'll list some problems:
1. You are constantly questioning yourself -- is life just about eating ramen noodles and working? Did I really study and get top grades for 20yrs only to barely life? Mabye I can sell out. This should not be a problem post Series A, but is def an early stage issue.
2. You have liabilities - student loans, healthcare, rent, etc. Sure, you can couch surf, but should that be expected of people?
3. After marketing and ads especially, you often dont make as much as you think.
Sometimes you make a limited time bet, and if things dont catch, you move on.