That's arguably true, though I'm also skeptical of any official numbers. The protests are not homogeneous at all: on one hand you have seemingly long convoys that are made up of small number of people, there are also very dense on-foot protests, it's somewhat hard to make an accurate estimation.

Still, making a statement doesn't require a majority.Usually if 0.5%-1% or more of the population starts protesting, the governing body responds, (or at least it should imo, having potentially more than 2-3% of the population actively involved in a political manner it's not a good sign: politicians don't want people too closely involved). This however vastly depends on the country, the culture, the people.Protests are also not accurate representations of the electorate.