I wasn’t involved so can’t say for sure. I’ve just seen a few kicking about.
There is ONE that I think exists, which I can’t talk about as it officially doesn’t exists.
Largely they fall over due to the management needs and continual updates required. And I know for me, gotta put the paid stuff before the free stuff, one these things done well, multichannel, can get expensive pretty quick, both in terms of time, money, and investment of expertise