We use cryptocurrency means, we have full control for our crypto and we will decide when we should sell or buy or hold or whatever we want. We become our own masters because we can manage it for our life. But unfortunately, right now, we can not do that because that will depend on the government regulations and they will not easily accept crypto because they can not fully control the crypto. But we have the power to control our crypto and as long as we can send our crypto to other people, we still are our own masters.
I think you misunderstood the question or maybe I misunderstood. I think the point made in OP was that, we see so many cryptocurrencies right now because people want to feel like the owner of the coin than the user of it. There are so many coins and nearly all of them serve the same purpose so why do we have them? I think one reason might be as discussed in OP that people want more power but the other basic reason is that people want more money and it's not possible to make the biggest amounts with other coins so everyone creates their own coin.
People love bitcoin for the same reason, they feel like the rightful owner when they have a decentralized currency. The same feeling cannot be achieved from a centralized dollar or any fiat for that matter.
Let's say I am misunderstood at this point. If that is so, maybe people want to have more money, and by having so many coins on the crypto, especially potential coins, they will have a chance to achieve their goals. Once they can achieve, they will feel become a master for their life.
We created our cryptocurrency to become a master for our currency because if we can use our crypto, we are not dependent on the other third party such as the government, which always wants to control many things. But unfortunately, the government still involved in this matter, so the crypto needs them to approve crypto.
We still become slaves because we can not use crypto to buy a product, service, or others without approval from the government.
By the way, after doing a little research, I got a few pages about that quote:
https://forums.macresource.com/read.php?1,2261692,2261741The quote is:
As I would not be a slave, so I would not be a master. This expresses my idea of democracy. Whatever differs from this, to the extent of the difference, is no democracy.
- Abraham Lincoln (Collected Works)
But there are more quotes from the other members. You can read it one by one.
https://www.quora.com/Who-saidSlaves-dream-not-of-freedom-but-of-becoming-masters-The-quote-was-used-in-a-recent-episode-of-The-Bridge-the-Hulu-mystery-series-set-on-the-US-Mexico-border-Possibly-Thomas-Pynchon-from-Mason-and-DixonWhile in Quora:
Who said"Slaves dream not of freedom, but of becoming masters." The quote was used in a recent episode of "The Bridge," the Hulu mystery series set on the US-Mexico border. Possibly Thomas Pynchon from Mason and Dixon?