MySurvey is actually and adaptation of a program that was started back in 1946. It began as the National Family Opinion organization that used to send out surveys through the mail. In 2001, they joined the digital age, and now they are one of the best survey sites around. According to the website, they have issued out more than $15,000,000 rewards to members.
Watching video ads: Video ads certainly aren't uncommon in the online world. While generally they're a hassle getting in the way of the content you want to watch, many paid survey sites have turned them into a way for members to make money. It's pretty easy to make a tab, set a playlist of paid ads going, mute it, and carry on with browsing the internet or taking surveys.
It’s a very well-known scam. You cash the check, then they ask you to either wire some of that money back to them as some sort of fee or buy something for them and send the item to them. So, you deposit the check, then wire some cash to them thinking that the check you just deposited will cover that. A few days later, after you already send them the money, the check will bounce and the money you send to them will come out of your own account.