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Other Microsoft OSS ventures makes me wonder if they haven't resurrected that policy too (e.g. the crippling slowness of azure mysql and azure postgres as compared to SQL server).

Google has largely outpaced Microsoft on what concerns Extinguish.

Can you give some examples? I haven’t seen Google close source something lately, except for Go’s package hosting server (which makes me inclined to believe you, I just haven’t heard of other instances).

Google Play Services pops to mind

All the Google apps that used to be open once-upon-a-time in Android and whose evolved versions are all closed source now.

"Extinguish" is often not the case in this decade.

It's all about capturing market share aka creating user lock-in.

User lock-in is how Microsoft has traditionally extinguished competition.

Microsoft Office is an early example. I know zero people that switched to it because they liked its functionality or user interface. They switched because nothing else could open Office documents correctly. Eventually, everyone I knew switched to it (and many happily switched away decades later, once “as-a-service” competition cropped up, solving the compatibility problem).