If I’m reading the “Lifetime concurrent users on Steam” chart on https://steamdb.info/app/753/graphs/ correctly, it’s a slight increase: today 28.0M, 6mo ago 27.9M, 1y ago 25.2M
But since then, the numbers increased until march 2022, where it peaked at 29 million and, after a short decline by a million until may 2022, currently stays at 28 million.