To-date I've had a so-so relationship with Youtubers/Streamers. Content creators took to Children of Liberty really well when it launched on Early Access, and even Jim Sterling didn't hate it (!!!) but despite sending out over 150 keys for Mondrian, a grand total of... I want to say 6 videos have been made, 2 of which have since been taken down. A good percentage of the other Steam keys, I kid you not, ended up on G2A and Kinguin. It became such a problem that we now spend an equal amount of time reviewing a creator's work and sponsors as reaching out to them. Pretty sure there's a Youtuber out there who's made more money off sales of our game than we have.
Yet they are a very influential arm of the media (though many would like to deny they're media) so all you can pretty much do is send them an email and keep your fingers crossed you don't get screwed.