It is a 'brave new world' that we are entering, Nachalink, and I suppose that it is our task and privilege to help form the rules thereof :)
My dad tested at 23andMe, just after Christmas last year. He has 997 matches there, and has received only two requests to share genomes. The rest have come from our end, and while most people generously have accepted, very little genealogical information has been available from which to work. We definitely have received a big breakthrough, thanks to '23,' but it arrived via DNA and a dozen or so surnames. No family tree was provided :)
Here, I currently have 36 pages of matches, which is strange ... because last week, there were 45 or more. Does this mean that I now reside in those ten people's trash cans? :)
Since testing at Ancestry, I have received four requests to share resources, all of which I have responded to with a big, Yes! I have sent out many more such invitations for sharing, both to those with public and those with private trees. About eight people have responded thus far. This response-rate issue may be just the nature of the beast :)
Perhaps some people were testing here, mainly, to help determine their ethnic roots.
Anyway, I am reluctant to view the open family trees of my matches, until some changes are made.