Blockchains give power to the people.
Well... some people. Typically, voting power is distributed by token holdings, computer hashrate, or some other "more money = more power" method.
Economically, this makes sense. The people with the most to lose have the greatest incentive to act in the network's best interest.
Technically, this is the simplest solution. It's really hard to prove (in a decentralized environment) the existence of a person for voting/power purposes. So, just distributing power based on resources allows you to do everything "on-chain" without needing to know anything about the real world.
But this solution isn't ideal for many applications. You can't have a true democracy. The power is concentrated to a relatively small portion of the population.
Blockchain doesn't have to solve every problem to be useful, but there are a number of problems (like this one) that if solved would open up a lot more use cases.
This week on the podcast, an interview with Jon Greenwood of GovernorDAO which is trying to solve this exact problem for dApps with their proof-of-existence tech. Give it a listen and enjoy!
P.S. I'm unaffiliated, not sponsored, and don't own any $GDAO. I think their tech has potential. DYOR.