There seems to be a general consensus here that most businesses have their IT use Mikrotik brand routers, weird enough it's only the router, switches and other devices often vary from unify to tplink.
This gets me confused, I thought people prefer mikrotik because it's just as good as the more expensive cisco routers and you use it for quality, but most cases they cheap out and buy low quality stuff (it doesn't make sense).

Is this a case of monkey see monkey do? or is there a definitive reason for this weird trend?

No idea, but usually with stuff like this there’ll be a particular supplier that pushes them hard cause the margins are good or whatever.