I agree, with you, I usually have little faith in “Online Polls” but, I must admit, the Drudge Report “Online Polls” during the 2016 primary and general election pretty much showed the winning trend that trump was on.
Just to make my point, I was 100% confident that DJT would win the election, but I wouldn't have bet any real money on the election. And I have been known to be a gambling man. 8>)