If you are unfamilar with the "[matrix]" system and just want to have free temporary access for 14 days so you can play with it in our "sandbox", click this sentence.

This should be a page that presents the user with no choices, refers to no concepts that the user will not understand, and sets the user up with an Element client and a matrix.org account.

Matrix.org should only offer temporary "sandbox" accounts that have restricted functionality to prevent spam, sexting, and other abuse. These sandbox accounts should only be allowed to post in a single existing, moderated, room. They should not be allowed to create rooms or post direct messages.