As a general rule, all first movers have an advantage, but that advantage came at risk. Bitcoin has been around 15 years now. So, where have you been?
Those first people had something that effectively had no value for a long time. Others joined and invested in mining hardware and didn't see a return for years. Still more came and the future was uncertain for a long time but people continue to spend real money taking a high risk that there would ever be a reward on them.
I myself acquired 4 bitcoins through mining pools way back in the day when they weren't worth anything. My brother did around 50 and when Bitcoin hit $100 he sold it because he didn't think it would get any higher. I held on to mine and I still have them to this day because no matter where the price got to for myself I never really cared. Although the price as it is right now I am considering selling and taking out my investment. But for a long time it was nothing.
Additionally I had an opportunity to allow Bitcoin payments on a website that sold virtual items. This was back when Bitcoin was quite literally worth nothing but also since we were selling virtual items they were effectively worth and nothing as well. I didn't take the risk of setting up a system for Bitcoin payments because I didn't have faith that it would become anything. Looking back that was a foolish mistake on my part because the amount of effort to set it up versus the reward that I would have today means I would never have to have a job again.
So when you talk about being new to bitcoin and those who have been in it a long time having an unfair advantage. It is not an unfair advantage that they took risk they made a gamble in many cases. Their rewards, I believe, is commiserate with their risk that they took and the faith and perseverance they had. Those who got in later viewed it more as an investment, which still carries some risk, but far less risk than those who initially amassed a great deal of coins.
If you look back at the vanguard s&p 500 fund, do you consider the initial investors is having an unfair advantage? Because those investors have seen a massive amount of profits. Same thing with Berkshire Hathaway. I think you're looking at it wrong as seeing the initial investors is having some unfair advantage it's simply that they took a greater risk and they have received a greater reward. The rewards are there for you now like any investment but as it stabilizes those rewards go down because the risk goes down substantially.