Huh? You're 100% being forced to see an ad. You might have not have fully watched it, but you did indeed get disrupted with an advertisement to the point of where you had to intervene with a button to no longer keep watching it.Oh stop being so dramatic. I don't like the pre-roll ads anymore than you do, but you're not being forced to watch them. You can skip them with a single button push or you can call TiVo and get them removed.
Really they should have an option to disable them in the settings, much like FiOS had on their DVRs. Most "normal" users will never figure it out and they'll profit, but those that are power users will know how to turn them off. No need to involve customer support or any of that jazz. Perhaps they leave them disabled for lifetime customers, etc. There are lots of A/B test permutations they should've run before pushing this into production.