"Mousetrap" is an anticheat technology developed for Rainbow Six Siege that's intended to detect and punish "spoofers"—that is, players who use mouse and keyboard on their consoles in order to gain a precision advantage over people using controllers. Ubisoft announced the system in February and said it was supposed to go live in April, but it may have jumped the gun on that a bit because some Xim Apex users are already reporting that their devices are being detected...
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Rainbow Six Siege mouse spoofers scramble to support forums after new anticheat 'Mousetrap' unexpectedly kicks in
Source: PC Gamer (opens in a new tab)