How are you going to make it fair? People who invest first take the risk to win/lose money. People who invest last complain it was not fair, but they refused to take the risk or were not there in the first place.
What if, instead of pre-mine, people who pay for the dev get a small percentage of tx fees for X years. So they don't get tied to the price of the coin (and are therefore ok with slight inflation), but they still have some chance at being paid multiple times what they invested (if they help grow the economy)?
What do you think?
That is interesting. I assume here you mean a one time payment at the beginning, aren't they early investors (which is 'greedy' and 'unfair'). How do you distribute the coins initially? With mining you get early miners and adopters. And you can't give all the coins out to do PoS because it goes against your pre-mine idea. You still need to find a way to give people coins and to do so without giving someone the advantage.
The point I'm trying to make is that someone will always have the advantage and it will always be unfair. Even if you start the world of crypto completely fairly by giving equal (theoretically preventing double+ shares) shares to the entire world, you still will get an unfair result because some people ALREADY own more than others (in physical shares) and can leverage that advantage to get an advantage in the cryptoworld.