I recently started using reshade program to make my games looks sharper and more vibrant, but I do know some online games has anti-cheat that bans these kind of stuff so I wanted to be 100% sure if I could use this Reshade program without risking a ban from an automated system
Reshade is ok! We forbid any third-party software that manipulates how the game functions, but Reshade is only visual in nature and you can use it without fear of getting banned. I even use it myself!
A disclaimer though: These kind of things are always subject to changing if new issues arise. While using Reshade is currently fine, I'd also be sure to check in on the forums regularly for any specific announcements regarding it in the future. I don't think it's too likely that this policy will change anytime soon but you never know.