Account security is player's responsibility, PUBG will not be liable for any incident arising due to usage of public PC or unsecured system.
Even if a illegal programs isn't launched and is just installed on a computer, the anti-cheat tools will detect and restrict the usage of such programs.
This can lead to a restriction to an account.
If you suspect that the computer that you are using to play the game might have illegal programs installed, please stop playing on that computer immediately.
Any restrictions placed on your game account due to these types of issues are permanent and cannot be lifted for any reason.