Yes but Gedmatch doesn't sell DNA kits, their data base consists of uploads from the major DNA sites. So on Gedmatch you indirectly get some of the other data bases. And you can see which data base the Gedmatch matches are from and then go there and do a search for those family trees. So there is a bit of work around.
That is an interesting question, would Ancestry lose their customer base if they open up to LE? I wonder how many consumers care? All they know is that they can get a DNA kit for $39 when Ancestry runs a sale. And the attached trees to the match list is superb, historical records and searches are fabulous.
But you could be right, it would spook the consumer base if LE is a major presence there. Especially these days.
But Ancestry still has to response do a warrant does it not? So LE can get into the data base if they want. I think CeCe Moore in a recent video was suggesting the Guthries beg Ancestry to let them in their data base?