Adding to this, it then makes sense why this isn't a thing in most developed countries as the burden of checking 4 apps seems to not be worth saving a few dollars for most people. In the US, for example, it seem like the two main competitors are Uber and Lyft, with Uber having 3x the sales as Lyft.[0] So it seems like most people will just check Uber and buy that no matter what.

[0] (Bloomberg) https://secondmeasure.com/datapoints/rideshare-industry-over...