Until further notice - unsafe.

And that can go into 100’s of different directions.
The Ethiopian crew must have been aware of the Lion Air accident and possible MCAS issues.
So either it’s related - or it’s not.
Liability wise nobody - read nobody - can help your airline from going out of business if it turns out to be related and powers that be decided not to ground the airplane.
And that’s why they have.
It’s cheaper to ground them now then possibly have to pay and go out of business later.
This wasn’t an emotional decision this was a business decision.