Customers were sold[1] a lifetime subscription to Honest Guy's taxis, and then Honest Guy does a secret deed to sell his taxi joint to Bad Guy[2] without telling any customer about it. Then customers start getting ripped of in all manner of ways, that some of them would have known to avoid if they knew their taxis were being run by Bad Guy.

[1] Of course, the issue here is that no contracts were signed.

[2] In the specific case I was replying to, there was no malice or intent to hide from you as seller. Yet, a better outcome could have been achieved by advertising the sale to those impacted.

I don't think there is any legal support for what I describe above, but in principle whenever a user signs up for Good Thing, and then gets baitswitched to Evil Thing, the main victim is the user, and it is fair to hold responsible everyone involved in the bait-and-switch maneuver.