So far there's been no indication that this time it's been anything but an actual grassroot movement.
Also - having Vučić around was probably better for basically everyone except people living in Serbia.
No one outside had enough interest to see him gone - hence no abroad supported the students. And he's been fucking up lives of people in Serbia long and bad enough to cause an uprising.
While I'm no longer a student, nor living in Serbia anymore. Still having there both older and younger family/cousins that are students and were part the protests - I had a bit of a glance of internal functioning.
It was literally kids/students from a city where rallies/protests were happening - self organizing food and accommodation for other students coming in from other cities.
Other people and business also pitched in with bringing out food/water/etc to the streets for students/protestors.