Quite the contrary - it makes perfect sense why Spotify isn't offering the family plan in SA.
Their family plan doesn't function the same as those for Play Music and Apple Music. Spotify does monitor IP addresses and location data, and requires that family members access from the same location. In the US and other countries with family subscriptions, students away at college have to take out their own student memberships to have Spotify, as an example.
This would be a problem in a country like SA where internet access is primarily on mobile devices over cellular connections, and often with older devices with potentially limited location functions. I would hazard a confident guess that Spotify is very concerned about an apocalyptic fallout from SA families falling afoul of the family location checks, either due to connection peculiarities where each member has a unique mobile connection or due to a large number of families not conforming geographically to Spotify's 'nuclear' family requirements.
I'm not defending the family sub requirements - just explaining why we probably don't have it.
Spotify has the most limited apps. Does not support uploads. Has no family or student plans in SA. No EQ. No playlist folders. No side-perks like original video content or (Google's) upcoming Youtube Premium.
But I am subscribed to Spotify and love it a million times more than any other music streaming service.
Reason: music discovery. It is the undisputed king. If music discovery is important to you, there is only one option.