Это бот. Периодически, примерно несколько раз в год, это безобразие здесь происходит.
Специалист технической поддержки ответил мне позавчера, что спам удалён. И вот опять)

I have used the app in the morning: there were not any Chinese on the application ribbon. I thought, is it possible that my complaints was taken? But no, there are immutable things there. Вот что у меня получилось.)

...There wasn’t any Chinese nonsense in the feed. I thought if it was possible that my complaints had been dealt with. But now I can see that some things in this world never change (remain unchanged)

Мне показалось: корейцы))

Может и корейцы)

Ура! Из почистили все же! Пойду поставлю пятерку службе поддержки

I logged in the app this morning - there were no Chinese (t)here/on the feed. I was like wow my complaints seem to have worked at last! But no such luck - now I see there are unshakable things out (t)here.