I seem to get banned, unsure why.

This seems solvable because there are a limited set of identifiers they could use to ban you.

- they may have banned your device, so I'd try using a different hardware to register

- Use an entirely different credit card. The "name" that gets entered in a credit card form is useless, so I wouldn't put in a real name either. I'd consider using another billing address too (same zip same house number, but different street)

- they may have banned your IP, so don't connect your phone to a wifi network when signing up or using your first few cabs.