Regular LearnToMod accounts are designed to be single-use. Each account is tied to unique access key and login email.
It's hard to track a user's progress (number of badges unlocked, block mastery score, etc) if the account is shared.
And if you choose to use LearnToMod with Minecraft, then we recommend having separate Minecraft accounts per each LearnToMod account.Though it IS possible for a Minecraft account to be shared among LearnToMod users, it's not possible to use it while a Minecraft game is being played at that same moment.
Teachers and students can get around this somewhat; our teacher accounts have a Minecraft username wiping tool, so they would only need 1 Minecraft account per each computer in their computer lab. However, students will still need to sign up and create their own separate LearnToMod accounts.