This is my first time seeing Microsoft acknowledge Wine's existence, and in this case, it was at least in a friendly manner? Or could there be bad faith behind this 'donation'?
While I am still wary of Microsoft after their previous anti-competitive behaviors, I think they've taken a more pragmatic view of late, and realize that projects like Wine are actually good for their platform as a whole. I expect if Wine/Proton did not exist, we'd see more (for example) Windows-only games ported to macOS or Linux. With Wine/Proton, those ports are mostly not necessary, and Microsoft gets to say that Win32/DirectX is something of a cross-platform gaming "standard".