> it makes MY recommendation of the original service seem bad
If your advice was "you get 10,000 emails per month free via $service" without qualifying "right now, but that isn't guaranteed forever, their paid tier is $x per 1000 emails and switching mail providers in the backend of your website will take approximately $Y hours at $chargable_rate", then it _was_ "bad advice" (or at the very least "incomplete advice").
I made this mistake way to many times before I learnt that lesson. (Most recently with Google Maps on websites...)
If your advice was "you get 10,000 emails per month free via $service" without qualifying "right now, but that isn't guaranteed forever, their paid tier is $x per 1000 emails and switching mail providers in the backend of your website will take approximately $Y hours at $chargable_rate", then it _was_ "bad advice" (or at the very least "incomplete advice").
I made this mistake way to many times before I learnt that lesson. (Most recently with Google Maps on websites...)