> they promised Tor integration like 4-5 years ago and all they did is setup 3 middle-nodes.

They never promised any Tor integration for the near future, see: https://news.ycombinator.com/item?id=17205441 and the first comment. Brave can do Tor integration because its user bases is much smaller than Mozilla's (scaling the Tor network to support the load from all FF users still requires much work).