This is a discussion on free credit - not even worth it within the online poker forums, in the Online Poker section; Getting free credit to play on sites, not even worth it to bother with. Anyone else get free credit? It reminds me of the constant
The ones for slots are definitely not worth it. If you decide to try it , you then get spam emails for every other site out there as they literally share/sell your email.
Save yourself the hassle and don't even bother.