1) It's one thing to make videos of your kid to share with friends and family. This isn't that.
2) Children in videos made for profit...until a person is old enough to understand what's going on - the exposure, the financial aspect, the potential risks - no matter how you slice it, it's a form of exploitation.
3) No one can predict how the child will feel about this when he/she gets older. What's cute or funny to adults, can be humiliating to a child growing up.
4) How about the child's right to privacy in his/her own home?
5) All it takes is one determined sicko to ruin these people's lives.
I don't watch the Trackers or any other YouTubers...just giving my thoughts as a parent.