It's surely not a motorbike. For a few reasons. For example, look at the position of his legs. The guy looks like he is pedaling, where his left leg is raised due to the natural movement when you pedal a bike. Then, look at the bike saddle in the background. An outline of a thin bike tire is also visible on the right side.
At first glance, it also looks like a horse race with people positioned like that, but after the picture is examined again, it is indeed a bicycle race, maybe a bicycle race is the answer.

I can already see something here 🚲, but the thing with these twitter games is they really get àlot of players dialed in which makes any bodies winning chances to drop as low as 1% , and personally I like to play were I feel chances to win are 50:50 not ¹/1000 because of the huge reception.. but trying won't hurt especially that it's free to enter..
The chances of winning a giveaway on Twitter will be greater if only a few participants join, if it is hundreds or thousands then the chances become 1/1000, there is nothing wrong with joining because winning 40 euros is quite decent.