Acquisition of GitHub let to increased downtimes, but also to unlimited private repos for the free tier.

The unlimited private repos for free tier would have happened anyways. You have to remember that this was around the time people were jumping ship from GitHub exactly because they didn't offer private repos for free. It was something many wanted, and they were actively seeking out other places that would give it to them.

Overall GitHub still got significantly worse since the acquisition. Downtime was essentially zero before.

Usage was 5% of what it is now before.

It was unreliable post acq. and before the slop-tsunami, the latter has just multiplied the underlying issue of their ipv4 only half assed azure migration.

... Which gitlab already had before github. And still does.