Yeah, you do still need to register it despite being under 250g because it has a camera. The rules are pretty complex but the short of it is that the best thing about these is that you can fly them in a lot of places that larger ones simply wouldn't be allowed without arranging permits etc. or often just not at all. So for commercial work you'd almost certainly want to keep both rather than being stuck with all the regulatory limitations of a larger one. But a Mini 2 can still pull off most of the typical drone shots you'll see with a bit of practice however ultimately it's just never going to be as good a camera as something like the Mavic 2 Pro with its larger sensor. But then there's always a better camera and even the Mavic is still very much in the class of being a fairly tiny consumer drone that's heavily compromised for size/weight.

However unless it's like TheVision's situation where it's just another camera in his bag rather than being his main focus then it's a hugely oversaturated area of work that people are trying to get into. It almost seems like there's more money to be made out of selling certification courses and exams and hyping the opportunities.