Something interesting to note, Nintendo sent a Cease and Desist to a leaker for E3, https://www.vg247.com/2019/06/10/nintendo-cease-desist-e3-leaker/
So it seems they're aware of leakers, now granted this a special case since the Nintendo conference is tomorrow, and they don't want anything getting spoiled early, but I do wonder if they were even aware of thani spilling out info, or if they were, they don't care about 3H enough to stop it.