Reminder of the value of testnet

Extension/Mobile/Both:
Both

Description:
Real case:
Recently, two novice users bought eth. The scammers sent them eth from the sepolia network. The users sent the sepolia eth to an exchange. When they could not see the balance in exchange, they came to ask for help, and then they knew they were scammed.

Can the UI of the sepolia testnet remind users that sepolia eth has no real value?
This is known to most users and may be helpful to a few novice users.