That it is a free piece of Software was the reason, I used it back then. Because as a student I do not really want to spend €3000 which was the price of C4D back then or Maya which had a similar price tag. And it is also the reason, many other people start using Blender instead of other 3D Software.
But even now as it became a job it is a big reason, I prefer Blender over the rest.
It makes it way easier to not Log in or Register every time you update it or install it on another PC and then something does not work or in a Company where I must wait for an Administrator who has to buy licenses and for that he must make a request which needs to get signed by the COO which takes 2 weeks.
And, on the other hand, I am not willing to give Maxon €60 per month If I can avoid it. But maybe that’s just because I am from Swabia ;p.