Sure it was, and for MS there is definitely strategic value in owning Github. But I even if you factor in that strategic value, Github is not as important to Microsoft as, say, Instagram is to Facebook.
Instagram is likely the greatest acquisition of all time in terms of synergy and mainly financial gains.
Instagram is worth hundreds of billions now. Bought for $1B. It is an actual unicorn situation of being incredibly rare.
There’s no point bringing up something so rare.
For example, the only other [tech?] acquisition that I can think of even sniffing IG is Priceline (now Bookings Holdings) acquiring Bookings.com for a couple hundred million. Now being the core of the business.
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Beyond that. Just to be geeky about this stuff. The only other general financial deals in this ballpark are SoftBank, Yahoo, and Naspers investments. Copy pasting previous comment:
SoftBank and Yahoo bought around 40% stakes each in Alibaba. SoftBank spent $20M in 1999, the year Alibaba was founded. Alibaba owned 34% as of the mid 2010s. Now own 26%. Yahoo, because of Jerry Yang, invested $1B in 2005.
Naspers invested $32M for almost 50% of Tencent in 2001. Probably the best investment ever. Naspers split into two companies. Prosus owns the remaining close to 30% stake now. Though Naspers and Prosus both own around one half of one another.
All three investing companies have had issues with their own valuations. They’ve all had their own market caps be undervalued. Their one investment alone usually was close to or even exceeded the entire market cap of the company. Still the case for SoftBank and Prosus.