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Satellites make conjunction avoidance manoeuvres on a regular basis; about 275 Starlink satellites need to move every day. A non-trivial proportion of those would result in a collision otherwise. Satellites orbit at multiple km per second and manoeuvre to adjust orbit much more slowly, so they need advance warning.

Satellite operators obtain much their space situational awareness data directly or indirectly from US govt sources. The fact that collisions are presently infrequent because satellite operators act on that data isn't a particularly good reason to eliminate much of it

Yes it has.

Source? Google doesn't give me anything.

There is a Wikipedia page:

https://en.wikipedia.org/wiki/Satellite_collision

There was a collision between two comm satellites about 16 years back [1], and that was with satellites that we could track and theoretically control - with the debris collision of 2005 [2], that makes two events.

We've been lucky that this is the only publicly known satellite to collide with another satellite, other than satellites that got shot down as a demonstration of power.

[1] https://en.wikipedia.org/wiki/2009_satellite_collision

[2] https://www.space.com/969-china-space-debris-collide-orbit.h...

measles was extinct in the US until the antibaxers gained enough momentum