Two major questions:

[Moosems]

1. Who will be paying for servers? Will their meeting be a major community server to use?
2. It mentioned the necessity for a PC in the README, will it be possible to use this without a Windows PC?

[Cracko298]

Answers to your Questions are in the #1, and #2 bullet points below.

1. You will not need to pay, the Mod will be a p2p based Multiplayer Connection, which is direct and doesn't require a central server.
2. Yes, you will need the Client-Side Application for Windows or a Nearly 100% accurate Virtual Machine (it will not support Linux or Unix Based Operating Systems at launch and no support for Android or IOS is being currently planned).
3. The release Window for this Mod is very weird. While no release date is currently planned. The possibility of working Early to Mid 2024 seems practically dull, since working with p2p Connections over the Network to send Packets really wasn't the best idea (if this continues the project could easily end up scrapped as stated a few times before by me, but i wouldnt say lose hope just yet).