

Those “last two data points” are two months. For OS X, there’s some upward movement the last two months (about 3%, which isn’t a lot given it spiked late last year from 8.3% to 14.07% to 8.2% in a span of three points), while Linux is practically flatlined with a very light upward incline just the last month.
To the extent StatCounter is useful to begin with, the Linux point is functionally meaningless while the OS X increase of a few percentage points may or may not be significant; trying to divine a trend from twitches in those two points is reading noise. Look at the “unknown” line, meanwhile, and see how it begins mirroring Windows’ decline around mid–late 2025. It rose from 11.3% in September 2025 to 21.5% in June 2026. That represents actual, meaningful, lasting change.





As noted in the OP, “use by” and “best before” (etc.) dates are vastly different from each other. “Best before” is very often ad hoc like “a year from the date of manufacture”, but if you’re past a “use by” date on your perishable food, you should approach it skeptically.
Climate Town has a good video on it and why this system exists as it does.