Tried Wii fit in the past and it was a big waste of time, same for my wife, she didn't make any gains from that, and buying resistance bands at a fraction of the price of Wii fit proved to be a much better investment for her. The reality is that you "might" lose some weight by doing that crap, if done with a low calorie diet, something like 1800-2000 calories per day, but that alone will make you lose weight slowly anyway.
I ran 7km per day 5 days a week for years, Barely losing weight that way. The reason why cardio doesn't work that well is because you don't build the same muscle mass that weight lifting will, and muscle mass makes your body burn more calories over time so you lose even more weight that way. I was eating 3000+ calories per day and working out 1 hour in the gym per day/5 days a week and in 5 months I lost 15 pounds (I wasn't fat, just wanted to get in better shape). I look a lot more fit as well. I'm not saying cardio is bad (in fact, I still do it every week), but lifting weights in conjunction with it is almost necessary honestly. Diets don't work since I love eating, so lifting weights proved to be the better way of maintaining/losing weight imo.
I know some will say it's better to do this than nothing. I will say though: stop being lazy and get out and just freakin train. That's what everyone else does. I work, I have kids, and yet I find the time to do it! It's the same for everyone, but some are lazy, and some are not and go out and run/hit the gym. If you need a "trainer" on YouTube to tell you this is the real deal and that it works, fine, but you are just lying to yourself. At least have the decency to put some headphones on, go out and run; you'll end up in much better shape than within some Switch game. Hit the gym before/just after work so it doesn't consume as much time out of your daily schedule. An hour 3-4 times a week is all it takes.