Firstly Hello and Welcome to our community, would be nice to have you here, you posted this topic in the right section as it is information about our community so no need to worry about that, lets answer your question and hopefully you'll get everything cleared:
1) We have Rule for PVP for each server, PVP is allowed in the wilderness on most server, and generally no its not a PVP based servers.
2) Cracked means the players who joins using unofficial Minecraft, Premium are the ones who bought and have a legit Minecraft account.
3) All the server can get unstable once they have a high amount of players connected at the same time, or someone is using something in the wrong way or have a bad setup somewhere, so generally all our servers are stable (except if there's a modpack bugs or issues we try our best to cover or fix them by ourselves if we can).
4) all our servers are non-whitelisted, just choose the server/modpack you want to play, get the server's IP and hit connect!
5) most likely no, you can check each server rule in its General Tab here on forums, if you are not sure about something you can always ask us on our Discord.
6) no servers will be shut down to my knowledge in the near feature, Servers wipes occurs usually after 8+ months from servers release/last wipe.
7) Server Rules.
if you have anything else please feel free to ask, hopefully i covered everything you wanted to know.