This is very sad, In crypto world, every lesson is learned the hard way.
This warning message in red on top been there for a couple of weeks now. I'm surprised how people neglect to take a glance on top for the "lock icon" and "MYETHERWALLET" in full caps.
I, personally, recommend spending ~$100 for a hardware wallet (Ledger/Trezor) to safeguard your crypto assets.