The 905, in part anyways. The service agreements with all 905 transit agencies were renegotiated last year, ahead of their 10-year expiry dates. The cost to the 905 agencies went up significantly. At least one agency seriously considered going back to paper tickets and transfers, as that would have been cheaper than Presto at the new rates. There was a lot of back room politicking to hush the whole thing up. The only plausible explanation for the hike in fees - given that the 905 was already on Presto, and in steady state - was TTC's entry to the Presto network.
There is a staff report to Mississauga Council in their archives about this, I'm not able to find a link at the moment.
- Paul