Hydrazine is certainly on some satellites, but by numbers of satellites launched and by mass of satellites launched hydrazine is not on a minority of them. Most

Hydrazine is certainly on some satellites, but by numbers of satellites launched and by mass of satellites launched hydrazine is not on a minority of them. Most satellites being launched by mass and number are now Starlink satellites which don't have hydrazine. Even then, the second largest category of satellites is smallsats and cubesats which often have no propulsion at all or use cold gas.