I was not, at any of them. Yes, I was effectively giving them my time but it doesn't sound unreasonable when you compare it to the alternative: I'd spend that same time answering whatever obscure coding questions or far-fetched exercise they had but in a far less comfortable setting (and arguably less representative of my skills). Not to mention how I'd probably have to do the interview at a time they're working, instead of doing it on a snowy Sunday evening, at my discretion.