what are the chances of playing hikaru nakamura here on chess.com

You need a rating of 2800 to play him usually. He always plays rated so won't play anyone under that.

Any thing below GM title, he has to consider or have a speacial reason why to.
I would say an FM lowest he would go, unless a NM or CM REALLY convince him.

I believe I saw it mentioned that he had once bought a new phone, having troubles with it and to see if it worked he played against someone 1300, ie to test the phone not to play as such.

GM Eric Hansen also streams often and plays with random viewers

Some of you guys are unreal. You hold this Nakamura up on a pedestal when the reality is that he's just a strange little autistic Asian man. The guy has literally done NOTHING in his life but play chess.
I don't think that saying the only thing someone is good for is playing chess is a viable insult on a chess website.
really I have no clue