This is a business that is 100% based on trust, the terms are all geared toward the casino and generally in a jurisdiction that is difficult or not worth litigating in. Any vendor, any brand, any affiliate program can break the trust at anytime.
Am I concerned? no.
I’ve happily worked with these programs since 2003:
Party Partners, Fortune Lounge, Rewardsaffiliates, Brightshare, Europartners, AffiliatedWeb, never had an issue. i’ve only needed to dump 2 brands for screwing players(none since 2004) and GFed for their “hosts file incident” a few years back.