You think that allowing corporations to move their SQL server investment off of Windows and onto Linux as a precursor to moving off of SQL server, rather than forcing them to change DBMS and OS at the same time is bad? That's what choice means.
Those who are moving off of MS SQL are "lost customers" and I don't think MS would be spending extra resources on facilitating their transition. More likely they had customers willing to switch to/stay on MS SQL but needing Linux for some unrelated reasons.
While I do think this is a good thing, I've run very good MySQL servers (well, in so far as MySQL is ever very good) on Windows, so it was already possible to do that kind of migration.
