I think this is a silly butt-hurt reaction. The truth is that players and their agents are doing the legwork to set up these kinds of opportunities. ESPN didn't poach him from us while he sat there like a wide-eyed innocent. He's a grown-up who hired an agent to make these exact kinds of opportunities happen for him.
And Witten was in the unique position of being a very visible player for a visible team, with a well-known name and a carefully crafted PR image that kept him away from controversy or unlikeable positions or harsher spotlights, and meticulously put him in bland, inoffensive positions for most of his career.
Together with his representation, he positioned himself as most non-Cowboys fans' favorite Cowboy. So signing him poses a double-dipping benefit of appealing to Dallas fans who love him, and Dallas foes who respect him.
To say nothing of the casual fans who just vaguely know his name and production from their Fantasy teams over the last decade.
And fans who think he's the bees' knees for non-football reasons because he stars in commercials with bland, mainstream, vaguely "wholesome" material that appeals to the people who just like players based on them mirroring the way they choose to see themselves. You could live in a Dallas-hating part of the country like Pennsylvania, and when your big, diverse family gets together for Thanksgiving and has a Dallas game on in the background as they spend the holiday together, your conservative uncle probably likes Witten because of that ad where he works out to country music that sounds like the stuff your uncle listens to. But your woke young sister-in-law likes him because of his commercials for that NFL program to get kids physically active to fight childhood obesity.
Witten's people made sure there's something about him for everyone to like. And they didn't do it for nothing. This is where it was always heading. And it wasn't an accident that it happened, though I'm sure Witten would never tell you that (and perhaps he didn't even bother participating in those conversations -- but I'm sure his people did, because he paid them to have those kinds of conversations).