Interesting Bovada used to do this for me I got about $30 in $5 and $10 increments over the course of a year back in 2015-2016no but i also got $5 credits a few times after long periods of inactivity.
They send u an email to collect it.
I got free $5 no deposit in an email from ACR have yet to deposit something about them being partners with Duck Poker is unsettling to me.