It is good to have alternatives to mega-corporations controlling the ecosystem.

Microsoft controlling GitHub is an issue, but one can see this issue emerging in different places too; see shopify puting pressure on the ruby ecosystem, ending with various developers who contributed to ruby (in particular via gems and bundler) no longer being accepted there (via RubyCentral's take-over, under shopify's directive and influence onto ruby). Many more examples can be given here. The thing is that money buys influence, ultimately dictating who can contribute and how. Python forcing mandatory 2FA onto all developers is also an example here - the hobbyist who just contributes code, has not really any benefit here, whereas corporations delegate more "security" onto unpaid folks.