Easy to say that right now, but Microsoft hasn't owned it long enough to have any negative impact on the service. For all we know 5 years from now they'll pull a Sourceforge and start bundling malware into your downloads.
Github made it through the "We need to deliver 1000x gains for our investors" phase of their history, but all that means is they've moved into "We paid $7,500,000,000 for this, are we getting as much value as possible?"
A few years from now, some brilliant manager realizes they can "add value for customers" by helpfully including third party software offers with github release downloads, just like Sourceforge did. Who knows?