Bluehole are apparently fed up with players simply stating "fix PUBG" so they launched a site literally called "Fix PUBG" where players can go after being frustrated with broken bits of the game and read how and when they might be fixed.
PUBG players can now visit a website dedicated to fixing their favourite game. Once you open the site, it will greet you with a disclaimer that Bluehole and PUBG Corp have been hearing "fix PUBG" phrase "a lot lately". If by "lately" they mean "two thirds of a year", then yes, they're onto something.
Either way, Fix PUBG doesn't seem to offer any way for players to submit feedback, so they will have to do it through ordinary channels. Fix PUBG seems to be of promotional or transparency providing nature, as it contains a roadmap for game fixes as well as fix logs letting players know that the development team is actually doing something.
There are different categories that PUBG Corp are trying to improve upon, such as client performance, server performance, anti-cheat, matchmaking, bug fixing and quality of life changes. Each of these categories is represented on a timeline going from August to October 2018 and players can click them to check their logs and work in progress.
Below that, players can find a short FAQ that states Fix PUBG campaign's aim is to "Destroy bugs, deliver long-needed quality-of-life features, and take PUBG to the next level by shipping fundamental performance improvements", which will take about three months.
Asking "but why didn't it take three months eight months ago?" and a partial answer to that question is in the second FAQ bit, stating that PUBG Corp are putting the "vast majority of our resources to addressing your issues with the game and implementing [players'] suggested improvements". This is about as meaningless as a PR retort can get.
The Fix PUBG website will keep getting updated as developers fix issues, introduce more optimisation and add new quality of life improvements. In other words, this page will be another way for players to see the same changes that get listed during regular update announcements.