Do you have any part examples of them committing to a specific support timeline on a product and reneging on it? I can't think of one.

Google promised their Nexus phones would get new versions of Android for X years then, after selling a bunch of them, just changed their mind.

I'm having a hard time googling it since every result that comes up is about Google cancelling Nexus phones entirely way back when, but I remember a lot of Nexus users were kind of PO'ed about it.