Gonna call you out on this, at least partially. It was SideFX, a real threat of a proprietary vendor who has sizable market share in 3D/VFX, releasing an entirely perpetually free learning edition and a low cost indie license who put the screws on Autodesk. Blender contributed to the decision, but it was absolutely not the primary pressure source.
Source: I have a Masters Degree in VFX, have studied the industry for over 35 years, and have worked professionally in it for going on 15.
Ummm, 3DS is owned by Autodesk, so you may as well consider them the same thing for this conversation, and Arnold is a renderer (also owned by Autodesk) and not a DCC, so not really relevant unless you are specifically comparing Blender’s built-in render engines to it. The reason I am not is that there are lots of plugins for Blender which can output .ass files to be rendered by Arnold, so it can be utilized if you want to pay the subscription.
Blender is a DCC. Not one that I am super familiar with, I’m a Houdini guy myself, but honestly it is better in a lot of ways than the steaming piles of shit that Autodesk puts out. The question is not one of quality or feature at this point, but one of capital and market share where it counts. If they could figure out what is needed to get the likes of Disney or MPC on board, or even smaller (though arguably still very large/high profile) houses on-board, then they would be seeing much more investment.