Sentinel is being worked on and improved on to counter new and improved cheat clients or bypasses by 3 very cool Anticheat devs, but keep in mind that Sentinel isn't perfect and some legit players can be punished by accident. (If this is the case, then they can appeal on the appeals site.)
Also worth noting that whenever a new patch comes out to counter a new bypass, there will always be a new bypass after that, basically becoming a game of cat and mouse.
If you like, I would suggest reading this news thread on more what happens behind the scenes and what Sentinel devs do when coding new checks or patches etc.
here