I just manually remove it. Or prevent it from getting installed in the first place. A lot of motherboards have a setting in the BIOS that controls the software getting installed, so you may need to take an extra step to turn it off there. (Asus and Acer are the biggest offenders, but Gigabyte and MSI do it on the more premium boards as well.)
Like if you buy an HP pre-built, there is a lot of HP bloatware to check for software updates, and some of it to do nothing more than report your usage of the computer back to the mothership.
Software like Killer Networking for Killer Network adapters can actually prevent you from being able to play online. Asus has a similar program, but they finally dumped it late last year and don't offer it anymore. These programs basically "boost" your game network speeds by blocking everything else from connecting. However they are based on technology from back when ADSL was the top-tier internet connection for people with maybe 25Mbps download speeds. The Asus software can literally cap your entire connection to no faster than 10Mbps. Never mind that you have 500+.
So basically, look through your installed software for anything linked to the manufacturer of your system. Take a good look at whether you really need it or not. Even GeForce Experience is nearly complete bloatware. They're getting better with offering tools more like what AMD has for overclocking your GPU. However most of the software will just screw up your game settings to unrealistic levels, and phone home your private data to Nvidia.
And honestly, going from being barely able to play, to a nearly stable 60FPS on a bottom-end system that was obsolete before the game was even conceived... Just by removing the bloat and excluding the client from security software. No overclocking. No non-standard tweaks to the way the client works by editing ini files. Just by cleaning up the garbage software. That is just a testament to how bad these programs are. And it doesn't matter if you have a fancy high-end system. That will still steal your resources and prevent you from getting optimum performance.