A steady stream of mods have been rolling out ever since in the PC gaming community. In fact, mods were popping up for Fallout 4 on PC the day that the game launched back on November 10th, 2015.
While that nebulous but large figure is impressive, keep in mind that official mod support for PC arrived late to the party, and PC gamers aren't required to go through Bethesda's official servers or website to acquire mods or the modding tools. They also noted that they would be using the metrics to learn and improve the mod support for Fallout 4 across home consoles and PC. They announced that the Xbox One mod roll out generated 50 times the amount of traffic that the official PC mod support generated.
According to Game Informer Bethesda noted that their servers were crushed for a while due to all of the Xbox One gamers signing in to download mods.