Microsoft offers Office for Mac. It's a thing they do. It's the full fledged Office suite. They see a Mac user the same way they see a Windows user - a source of revenue.
Not always. There's no Minecraft for Mac, they even prohibited Macs running the iPad version. It's essentially been ported to Apples APIs but purposely withheld from macOS.
Anyone on Bedrock Minecraft is probably there for the cross-platform multiplayer. The Java version doesn't substitute for that. (MS made Bedrock and Java incompatible so they can rent-seek on closed mod and server-hosting "marketplaces"; can't let people share things and have fun without paying a middleman after all, think of the wasted "productivity"!)