But, "I wanna create a server just 4 fun, with my friends".
The main problem here is not the preconfigured pack, but rather the ability for anyone to publish such a server. This is one of the main reasons why the game is dying.
In my opinion, it's not a problem at all to lend a hand when a newbie can't find where to change the mana potions in the XML files. However, I do have a problem when they need modifications on the Java side and don't know what an IDE is, all while the server is in a live state with 10 people online. This is embarrassing, sad, and mainly a problem.
It is really sad that anyone out there can publish a server within 20 minutes without having sources, using the phrase "the best server," and then (while these few ppl left) close it after 6 hours by saying "I will open another one in 2 months with crazy new features," when all they doing is changing 5 HTML and one buffer.
Unfortunately, there isn't a rule about this (although I wish there were). So, you can't just avoid this issue (I'm sorry).
P.S. A gift for you:
https://prnt.sc/ExntaP6dKy9f