Wow. That is very disappointing. The one reason why I stayed with my T-Mobile service was the free hotspot feature of my htc sensation 4g. I certainly won't be upgrading to its now, and will likely leave T-Mobile when my deal ends. Sure the others charge as well, but my T-Mobile service was already a compromise of poor coverage for me.
Yeah, I'm sure there are lots of people who have no idea that their free tethering wasn't intentional (or, if intentional, that intentions had changed).
If you want ICS anyway, CM9 and AOKP are coming along reasonably well for the Sensation (including the T-Mobile variant), but that's only a temporary solution, of course.
