> Grammarly was founded in Kyiv, Ukraine, in 2009 by Ukrainians Alex Shevchenko, Max Lytvyn, and Dmytro Lider, and it still maintains a major office in Kyiv alongside its international headquarters

Part of the reason.

Later edit: Meaning some of the people from that part of the world have become accustomed with this type of behaviour knowing full-well that there will be no repercussions, to the contrary, it wouldn't surprise me to read that canceling a contract with Grammarly means giving in to the Russians.