Earlier quoted context omitted.
True, but not taken seriously by cab drivers. I've had many broken card machines in a black cab, and when challenged, it almost always lead to a, "alrite, get out mate" — or a, "well I can try if it works again, it didn't earlier..." I didn't report them, and with their ongoing nonsense and this now, I'll definitely make sure I will from here on forward.
You absolutely 100% must report them. Seriously. Every time. It's the only way we make it better for everybody. The requirement for it to always be available is a new one - it was introduced in recent months. So if your experience pre-date that, that behaviour may have changed. If it hasn't you absolutely 100% need to report the driver to TfL.
The easier way is to use a service that doesn't suck, and let the services that DO suck go out of business.