They still do this in a formal way and i promise i don't work for MS in any way; It's called Microsoft for startups and you sign up with vague details about a startup and they throw 5 enterprise visual studio keys and 5 full office subscriptions your way along with a few thousand dollars of azure hosting credits to get you hooked.
About 20 years ago the Microsoft for Startups program included the full MSDN subscription which was ~5 keys for every product they ever made. 5 keys of Windows XP, 5 keys for windows server, 5 keys for 2000, 5 keys for every variant of Office. Very popular at LAN parties and they never did recall any of those keys. Today it seems they just give you developer tools and office, not the OS.