Blizzard has started the longest period of Overwatch being free to play since the game's release.
Overwatch has always been a premium game which was partially a deterrent to potential cheaters as well since they would have to pay the price of admission each time their account would get banned. More importantly for the game's long-term sustainability though, is that OW was attractive enough to keep getting new players for several years, despite numerous free-to-play options floating around.
The game has occasionally dipped its toes into the free-to-play territory, however, with events such as free weekends that were followed by discounts on the subsequent purchase. Still, this is the first time Overwatch was free-to-play for this long.
Anyone who is interested in trying Overwatch out can play the game for free until January 2, 2021. Just like the free weekend events, the access to the game is not restricted - you can play anything you like and everything you unlock will stick around should you decide to buy the game afterwards.
Keep in mind that Blizzard has been going through a turbulent period of time due to horrible mistreatment of the employees that went public but also the limbo that Overwatch found itself in. There is no doubt the game is bleeding players because the content is extremely stale and the latest hero was introduced on April 14, 2020 - more than a year and a half ago.
The extended F2P period is probably an attempt to revitalise the player base but if the state of the Overwatch League is anything to go by, the feat might end up much harder than it looks.