Look at the difference in price by yourself. Anyways talking to you reminded something feasible. Geogram isn't only an ESP32, there is also an android and a web app.
Can't include a monero miner on ESP32 but can certainly add one for the other apps.
Look here: https://github.com/XMRig-for-Android/xmrig-for-android/
Some of these phones are used in geogram as stations that don't go anywhere and are always plugged. So we might as well use them for mining when the owner decides so.

