For the phones that do come with games pre-installed, check to see if your phone has a pre-installed "smart clean" app.
On my LG V30 from ATT, all I had to do to uninstall the pre-installed games was to wait a month for the games to become an "unused app" then let the "smart clean" app uninstall them.
Unfortunately, this does not work for all the bloatware installed by LG and ATT.