And just so you know: Yes, the NSO Playtest says this once you participate (website datamining): "We request that you do not discuss or disclose content from either the Nintendo Switch Online: Playtest Program test software or website with others."

If it's gonna be like the closed beta for Mario Kart Tour, people are gonna leak stuff anyways

Don't these things have to be advised beforehand? Maybe you are going to enter to talk about it and wouldn't if they demand you not to. It's weird we have to "bend the rules" in order to play by them.