Life hack: If they try to sell you "endless"/"unlimited" anything, it's most likely a scam.

Example: Fusion energy is dubbed "unlimited" energy. Nevertheless, it's unclear if the heavy Hydrogen, needed for fusion, is abundant (not unlimited) on earth or if it will be made from Lithium. And *even if* we get it from "tha moooooon", it might be abundant (not unlimited) but not free (as in cheap).