From at least two angles this is great news for Gitlab. But it feels a bit like the Atlassian / Trello arrangement, which has had little impact on users. From recent behaviour I'd expect Microsoft to have a very light touch here.
I'm not familiar with recent behaviour anything in particular? (My memory goes to Skype...)
Post Balmer we've seen a more open (in the transparent, consultative, community sensitive sense) attitude, with genuine contributions to free software.
People also seem to be citing LinkedIn as an example, but that doesn't feel like it got any more unpleasant since the buyout.