Bullshit. I see no difference, especially since they actively discriminate against male riders and male drivers.
I don't have a problem with Muslims telling callers that they don't allow alcohol or drunk passengers when someone calls their office to see if they will be of service. I would even applaud them for having an app that handily redirects to a service that will.
I do have a problem with Muslim waiting in a line of cabs showing intent to give rides to people who show up in the line and then refusing.
I would require that the Muslim cab company's ads and taxis say "no alcohol" but otherwise I agree with you. There are plenty of other cab companies, such "discrimination" will do only a tiny amount of harm so long as they are upfront about it.
Discrimination only has a substantial bite if it's either widespread (and Muslim taxi companies are not) or hidden (the taxi driver shows up and won't take the blind guy to the airport because of his dog, and thus he misses his flight because he's far out and there's not enough time to get a replacement taxi.)