To me that seems like not saying hi, rather a device to shift the risk of engaging off of you. Don't be scared. Just say a few banal words to people you don't know every day and gauge their reaction, start a conversation if you like and they seem to be up for it.

Agree with what you say, sometimes an original idea blossoms and improves the state of the art, especially in UI. Those that do this work with that intent rather than IP are very much appreciated.

As for patents, heard of Ralph Baer?

Surprised no one's mentioned misuyabari yet... For all your tiny kawaii miniature animal topped needle needs, hidden in a rustic shack in a courtyard in a mall.

Ooh they have a website now! https://misuyabari.com/

And a lot of the other half want to grow their idea into their own mega-corp. This is YC after all.