Filth

This mod has Microtransactions!

Even if that wasn't explicitly against Minecraft's terms of service - (Which it is) - I still hate the idea. The fact that this mod has been able to get as popular as it has without triggering any form of retribution will encourage others to follow in its footsteps.
A huge part of what makes the Modded Minecraft community so special is the capacity for anyone to assemble a modpack just how they imagine, these massive experiences of mods from hundreds of creators unified under the creative vision of a single individual, or small group, and then becoming accessible to everyone. A paywall of any sort blocks that opportunity on both sides, creatives cannot create, players cannot play, and even if the paid elements here are just cosmetics, a mod with over 100 million downloads breaking ToS will invite more.

The mod works well or whatever, but you can use E4MC for a similar experience, without all the cringe, or set up Zerotier One, which is a little more difficult, but will also work for other games.

It appears that the next vanilla update will be adding a similar system, and I hope it kills this mod. Do not give them your money. Donate it to any other modder, or to charity, or buy Sea of Stars, that game's great.