ChatGPT answering to you:Bit niche, no?
While we don’t have a precise count of total desktop PCs, consider that in 2025, there are over one billion PCs in use globally.
If those figures include desktops and laptops and if Linux has ~4%, that's in the ballpark of 40 million devices.
In the U.S., that percentage translates to a smaller subset but still several million Linux desktop machines.