[roblabla]

I for one do not trust the ISO at all. They are a profit-seeking organization with an opaque standardizing process. That the ISO9660 standard (you might know it as the .iso file format) from 1988 is still locked behind a 140chf payment is a disgrace. And that won't even give you the full standard, because ISO loves doing this thing where a standard will reference 5 others, which themselves reference 5 others, etc...

IETF is one of the best standardizing organizations out there, I'll certainly give you that. They have fairly transparent process, and a really good track record when it comes to creating robust protocols.

Thing is, I don't see why Matrix.org would have any more or less "cachet" than WHATWG, or Khronos Group. In the end, the identity of the standardizing org doesn't really matter too much. What matters is that the incentives of the standardizing org are aligned with those of the community.