No free cards period.
Find the fold botton if ou think you're beat, eg reraised
Free cards can end up with you outdrawn, put in sticky situations where opp bets top pair hard and you think you're beat and it allows you to be bluffable. Plus you gotta lose some ev. Dont give em when you have a made hand, unless you have opp more than one card behind in which case there is the option.