What makes you think there are no alternatives to Uber in EU right now? Actually, it's the opposite:

* ride hailing alternatives: FreeNow, Bolt

* food delivery: Wolt (technically owned by DoorDash, but still), Just Eat, Bolt Food

* bikes / scooters: Tier, Bolt, NextBike, Voi, and many others

If Uber leaves, there won't be any void to fill.