On: TfL's simple pop-up message led to a significant d...

[ranit]

Arguably indeed. Depends what is considered the service in this case. I would argue that the service is “using the public transport “, and it is not “using machine for buying paper tickets”.

[ubercow13 → ranit]

So then rephrase their point to "it's trying to stop you using <this way to pay for> the service"