Having said that, I am usually empathetic to these kinds of 'unlimited' deals because even though they aren't really 'unlimited', they do tend to be generous to the average use-case and average user .. Inevitably, and unfortunately, someone decides to test the limits and the entire thing collapses.

It reminds me of the Blockbuster "No more late fees" policy, which was a really good customer-friendly policy (speaking as someone who regularly returned rentals late) .. but then they were sued because an aspect of the policy had Blockbuster charging the cost of the rental to the customer if it wasn't returned in some period of time .. and because that charge looked like a 'late fee' they got sued. Urgh.