This site simply discloses how much money the American Tax Payer has given to that organization and the goal of that grant. The information is already public and it should be public. There is no threat vector here.
Arguably the information here is kind of useless on its own since it is hard to evaluate the popularity and efficacy of the individual grants, but I suppose a more motivated party might find this resource to be helpful.
My first random search yielded a $3.3M grant to Alaska Fish and Wildlife to maintain 3 public shooting ranges. Off the cuff this seems like a dumb use of tax dollars, but who knows how this actually stands. Maybe this is split between 10,000 people and $300 per person is really how these people would like their tax dollars spent.
Why? This website run by a very biased party and they are pushing an agenda here but in principal what is the problem with searching where federal funds go?