https://www.hosthorde.com/terms/#usage With Minecraft servers, the software requires a specified number of player slots to be set, as well as a set memory limit and storage limit. By default, your Minecraft server will be set up with a player limit of 100 users, a memory limit of 6GB, and a storage limit of 20GB. These are soft limits, and will be increased for no additional charge upon request. So, it's not unlimited like You came and got unlimtied on everything, but they could increase your performance if you have some reason for that without additional charge.
