Uber isn't dealing with a shrinking market. They're becoming critical transportation infrastructure and their business keeps expanding year after year.

$32b -> $37b -> $44b -> $52b -> $57b

That's Uber's sales growth year by year. And now they're solidly profitable.

The sole threat to Uber is the Waymo / Tesla automation angle. A merger is most likely there.

Why do I need to care about profitability as a business if I can capture a shrinking market? /s

It feels like a related statement to someone willing to burn their own country to rule over the ashes.