These datacenters in space will become space junk. Doesn't seem to be sustainable. With a million of these it's hard to imagine why this would be a good idea, and it starts looking like insanity.

The data centres are for the secret radar constellation masquerading as an ISP company that is Starlink

You are watching the slave grid being erected over your head

https://www.youtube.com/watch?v=jbp3kdJZ1_A See 1:38:00

Shouldn't we be able to detect radio coming from SAR satellites? If SpaceX were to launch a cover SAR constellation, why can't they just use starlink as an excuse, why do they have to invent a new businessline?

Nope, they will be in a low earth orbit that will decay and enter the atmosphere without maintenance burns

They'll all have a sun synchronous polar orbit.. I don't think they'll be very low orbit, unless they are like trains, at every 1km a satellite.

And it will impact negatively humanity's health.

https://engineerine.com/starlink-satellites-harming-human/

Not a single source to a claim in sight.

Oh, wow. I was assuming it might be about toxins released when they burn up, which seems implausible, but radio waves fry your brain? Seriously?

Not really, if you look at the plans, only a few hundred thousand satellites were planned in LEO, and millions over the Chinese satellites.

There will be a collision at some point, there's no real-time communication between USA and China satellite launches.