Does anyone know what going on with that?

Not much. I found numbers from 55 to 400 arrested country-wide in two days. They'll get 20 days and a fine at the very worst. I think you can surmise how widespread and consequential these protests are. As I saw someone say on TG Navalny's hamsters remaining in the country can probably be caught on one camera shot from a drone if they were in one place.