what are the groups , I mean are they only bitcoin targeted or more specific like gambling targeted
I saw someone on youtube who had a software that posts automatically on facebook groups , he used to promote some ponzis on all money making relative groups
so are you going to promote the same way , cause it's pure spam IMO
if it's really working I would recommend you to start promoting your affiliate links , it should really be profitable
These are Mostly Bitcoin Related , There are Only Few gambling related groups .
I am Not using software Its manual Because Its safe . using Software There is a chance that Your account can get Banned .
If you are doing it properly , It shouldnot be considered as Spam .