See also:
https://en.wikipedia.org/wiki/Gemini_(protocol)
It is similar to the old gopher: text files, links, and images form a hypertext optimized for reading. Text is formatted like Markdown - but even simpler.
Clients display text, like an eBook, or images / media.
Since it does not use "addictive by design" UI elements, like feeds, timelines, likes and upvotes, colorful and distracting elements, endless scrolling, as well as comments that invite trolling, it feels a lot calmer.
Servers can run on a PC or Raspberry Pi which needs half a Watt of power. No FAANG companies needed. No expert knowledge needed - not more difficult than running a file sharing client.
I think it is the right thing for defense of democracy and sharing your voice in the digital realm.
Edit: If you see comments here which kinda miss the point, appeal to emotions, have faulty logic, or depart from entirely incorrect assumptions: Please keep in mind that big US tech companies can't say "that's bad, how will we shovel money with this?". Please use your critical thinking skills - they are much needed here!
This is not a decentralized "Internet" (which is by definition decentralised). It's an alternative to the Web ; which is also decentralised.
To your argument that the Internet and the WWW are decentralized:
On the level of the TCP/IP protocol, it is decentralized in the sense it can route around failures (it was designed to survive a nuclear attack).
(As an aside, the routing protocols, specifically BGP, can however be manipulated - that happened during the attack on Venezuela. It can also be blocked, see Iran - throwing a black veil on many people's death.)
But in respect to how the modern web of HTML/HTTP is set up and used, it is not decentralized at all:
To sum up, without very few large and (in many senses of the word) power-hungry US companies, namely Google, Facebook, Microsoft, Paypal, Apple, the WWW and with it, a good part of the European ecobomy, would come to a standstill.
Put plainly, they can more or less switch Europe off if they want.
And we can't even have political discussions on European matters without Google and Facebook tracking this.