Apple brands itself as "different" and progressive, using '60s counterculture icons, then turns into the most prudish schoolmarm imaginable and bans any app that could offend anyone — including a Pulitzer-winning political satirist, and any book-reading app that doesn't explicitly block you from reading the Kama Sutra. I swear I am not making that second example up.
Apple proceeds to promise developers that adult-oriented apps will be accepted once parental controls are in, accepts a bunch of them at that time, then retroactively removes all of them from the store with no recourse for the developers. Apple also arbitrarily rejects apps (much more viciously than Google rejects Web pages — Google around and you'll read horror stories), and kept Google Voice in approval limbo for more than a year.
Not saying it's fixed, but I do think it's a lot better.
Google says "do no evil" yet arbitrarily punishes websites with ranking, cancels people's adwords and adsense accounts, and employes (apparently) zero customer service and has no interest in resolving any issues people might have.
Microsoft- do I really need to go over the history of microsoft's lapses in integrity?
Dell-- was making all of its profit via kickbacks from intel and failed to report it to investors, denying investors an honest accounting of how its business was really cratering.
I could go on....