Honestly no, never heard of a shop "just checking" your alignment. I've had a mechanic recommend getting it done by eyeball, but never had them just run the tests without agreeing beforehand.

But at 2-3 years I'd be taking the car in to get it checked regardless of its age as alignment is based on your miles driven and conditions driven on. It is possible that both the business was being scummy and for the car being out of alignment. Not sure I'd get it done at that mechanic regardless.