Tokenbets has seen a surge in activity lately, likely because of the Winter season approaching, and I'm assuming it's the same case for other sites.
The dice on Tokenbets and BigBoiBets is Provably fair, meaning it's unriggable, here's an example roll with instructions on how to verify its fairness https://www.tokenbets.com/dice/verify/583cbf16452b4e065815a28a
The poker client on Tokenbets and BigBoiBets is licensed from https://www.briggsoft.com/ , it's a third party close-sourced software that we have no control over.
The roulette on Tokenbets was also provably fair, but it's currently offline for maintenance.
I've never tried playing on Runechat so I'm not sure how they assure their userbase that their games are unriggable.
In response to your cashin/cashout question, I haven't seen any issues, though the sites vary greatly in the speed that they cash out due to the structure of their staffing system.