What's the supposed lesson? To close the shop?

Never use someone else's wallet to hold your money.

Not your keys, not your crypto. Use a nice safe hardware wallet. Just check for extra SIM cards first, and audit the key generator.

Which is itself ironic as some of the most common hardware wallets have also had issues recently.

The idea that someone would have to buy a hardware wallet to be safe, but first audit the hardware and software is both a but ridiculous and infeasible. Unless one can actually inspect the code running on the device, auditing am open source library online doesn't tell you what is running on your device.

It's almost impossible to verify the code on the hardware wallet really matches the code they released and that the hardware has not been tampered with.

Maybe the sim card is on a timer to broadcast your keys after a year, so you just can't detect cellular signal usage now.

To securely own bitcoin you have to first create a new chip fabrication plant to then make your own hardware wallet.

It's insane that one has to go through this to be somewhat safe.

Roll the dice

But that lesson does not apply here.