I'm struggling to call this predatory pricing when most of the food delivery app industry is unprofitable.

The correct industry action: push through higher pricing for the end users, share gains with drivers and restaurants to get to a sustainable business model, and accept the resulting decline in unit volume. (which also means fewer drivers will have jobs, so there's a human cost here as well)

It's easy to tell "corporations" to just suck it up, but you're dealing with a pure variable cost business here. If you make it unprofitable to serve a particular geography, they'll just exit the market. That only consolidates future market power in the surviving businesses....