I'm losing weight riding an ebike because my commute is 35 miles RT (with 1,500' combined ascent), and the ebike allows me to do that commute 4-5 days a week, as opposed to my non-ebike that I can only do 2-3 days per week because my knees get too sore and I choose to recover instead. On top of that, when I was on the non-ebike, on the 3 or 4 days a week that I knew I wasn't riding the next day (because my knees were sore), I would tend to drink too much beer and/or to much wine with dinner. The ebike keeps me riding more, which helps me to consume less.

Full disclosure: several years ago I did lose 60 lbs in 18 months riding a non-ebike, but I was able to ride 6-7 days a week because I hadn't yet blown my knees out (from doing hardcore sprinting). My new ebike is getting me back in the game.