I mean, I think it's really about dating someone you're attracted to, rather than trying to date someone who does or doesn't do YouTube. But I have dated a few girls who made videos. My girlfriend right now is very involved with my channel (helping me come up with ideas and stuff), but she's too shy to be in videos. It's just kinda like sharing a hobby with anyone. You have someone to talk to about what you're interested in. Help each other grow each other's channels. But there's always that awkward decision you have to make about how much of your relationship is public. Fans might get obsessed with it, and trolls might try to sabotage it. And if the relationship goes south, there's bound to be fallout for both parties involved in their channels unless it's perfectly worked out. But if two people can manage to perfectly work that out, it's unlikely they'd be breaking up in the first place.