Help on disabling client-side mods in an Aternos server

I've been trying to run an anarchy-like server in which no sort of external programs/mods that give certain benefits to the player using them are allowed. Recently, it has come to my attention that a certain player has been using a client-side mod (journey map) to see where the other player's bases are. Is there any way to disable these sorts of mods or at least detect them?