It can’t have any conspiracy on this, autodesk provides an regular updated FBX SDK, the one used by any brand that develops any 3d animation software I0 think about blender, lightwave, cinema 4D or 3dcoat, and some more.
well all this developers can freely get the FBX sdk and include the support of this file format into their 3d software.
Long time ago everybody thought that the most common and universal 3d file format to exchanged between various 3d app would be Collada format, but finally the FBX become has won against collada.
Epic and Valve offers payed blender foundation so they can hire proper people to have a consistent support with the two engine ( source engine / unreal engine )
so there is no conspiracy, blender is good tool if you know how to use it. Maya is better when it comes to handle multiple projects, and build a good pipeline of tools for big or small studio .