Things have improved significantly in my personal experience, but PlayerUnknown's Battlegrounds still has a cheating problem. As part of their effort to be more transparent, PUBG Corp has admitted as much and is working to improve the experience for players. PUBG is an entirely PvP experience and, as such, the developers established a dedicated team that has been working to combat cheating programs. An internally developed solution that has been running in test servers will be introduced to live servers next week.
The focus of this solution, as described in the Steam community post, is "blocking unauthorized programs but it will be further developed to broaden the scope of its abilities." It will also block programs that alter graphics or aid in gameplay in some way. Some users will be perturbed by this, but those programs share a functionality that transforms game files. This is an early version so, simply put, there will be unfortunate casualties as the developers work to improve the PUBG experience for everyone (except cheaters, of course).
File modification, a service that has been most recently used to exclude Miramar from the map selection while queueing up for play in PUBG, will be blocked for the time being. Account sharing is also being deactivated because the team has identified vulnerabilities that are being exploited. More information can be found on the Steam post.