Are you asking everyone to sign an NDA upfront?
Like Oculus did and got bought by FB.
Companies aren't interested in ideas, they want something they can drop in or can see using in 6 months.
* I have over a dozen patents. Learned this the hard way.
I am not a lawyer, but in my understanding, once you file, you have a priority date.
I hold an Australian patent with a US one pending. Both trace their priority back to 2012, when I made an initial filing through WIPO.
For each national patent granted, my patent coverage is backdated to 2012.
Either your idea is patentable, in which case, you might as well brag. Or it's not, in which case, you might as well pretend to brag.