Konstantin dmz9
As of January 2020, 1.0% of all web sites use Windows-1251.[1][2] However, it is used by 11.0% of Russian (.ru) websites,[3] where it is the second most popular choice after UTF-8. In Linux, the encoding is known as cp1251.[4]
11% при учёте, сколько в рунете стрёмных задрыпанных интернет-магазинов -- это хороший показатель, КМК :)