I think we just have to accept that people have different reasons for DNA testing - their goal is not necessarily the same as your goal.
Some may have been given a test for Christmas or birthday, but have no real interest in the results. Some may be interested in the ethnicity reports, though they may be disappointed when their results come in. Others may be interested but have no knowledge of their family, as in the case of adoptees.
Whatever the reason for testing, the more people who do test, the more matches for everyone else, tree or no tree. Whether it is by looking at shared matches, by messaging matches, or by a bit of general sleuthing, you can sometimes find a connectIon.
So, frustrating - yes. But we just have to accept the nuggets, in whatever form, that come our way. If I found genuine connections with all of my many thousands of matches I would be overwhelmed with information.
Regards Margaret