The appeal of VaM over others is in its sandbox nature and those trying to emulate that are well behind in terms of features and modding community.
So i personally i dont see holodexxx being a competitor for VaM since both it and holodexxx are going down different paths in terms of what they offer.
Not so different as you think but yeah they have another idea of distribution and rather want to sell you their content but who tells you that they not going to change their minds about it and further work out the Scope of the Studio with integrating more Complex Logic Building interfacing with Blueprint directly and building a 3d Interface ontop of the Studio for it.
That's why i used the word Dangerous, true they are even still far away from the Physic Complexity overall but even that can change.
But yeah they rather concentrated to get their Scans in Mobile AR distributed, but who knows.
And i think that cooperation with either the Naughty Sandbox Dev or Captain Hardcore Dev and result sharing failed horribly whyever.
Good for VAM if they rather stab each other or find no common interop to build a bridge on
The more they wait the harder it will be to ever catch VAM again