Valve has restricted viewing of high-rated matches via DotaTV

In Dota 2, it is no longer possible to watch high-rated matches via the “Watch” tab. This was reported by Team Spirit analyst Mark “sikle” Lerman.
The quote is reproduced with the source’s spelling and punctuation intact
It is now impossible to watch matches of friends with >8500 MMR via DotaTV. Attempting to do so will result in an error.
We can reasonably expect a rush to buy and sell personal replays from high-MMR players. <...>
Previously, the developers restricted the ability to watch games with a high average rating for users on the friends list. This feature was used for automated data collection on professional players’ matches.
Photo — Valve.


