The Russian troll/ web brigade is so well known that it has a wiki page.
Web brigades - Wikipedia
The web brigades ( Russian: Веб-бригады), also known in English media as the Russia's troll army, are state-sponsored…
They are getting paid to do this. I always like to think after wandering into this brand of surrealism that I just helped some person put food on the table for their kids, or buy tickets for the ballet to surprise their partner.