And in the last 48 hours, Steam peaked at 39.5M users online, providing a highly pessimistic lower-bound on how many PC gamers there are.

https://store.steampowered.com/stats/stats/

If you consider time zones (not every PC gamer is online at the same time), the fact that it's not the weekend, and other factors, I'd estimate the PC gaming audience is at least 100M.

Unfortunately, there's no possible way to get an exact number. There are multiple gaming PC manufacturers, not to mention how many gaming PCs are going to be built by hand. I'm part of a PC gaming community, and nearly 90% of us have a PC built by either themselves or a friend/family. https://pdxlan.net/lan-stats/

For comparison, the lifetime sales of the first Nintendo Switch would be considered a good year for iPhone sales -- six generations of phones sold >150MM units.

https://en.wikipedia.org/wiki/List_of_best-selling_mobile_ph...