Another shady “competition” is the “complete this form and get a laptop”. Except it’s not just this form, it’s this form, and this form, and this form, and this form... until the user gives up.

Each of those forms goes to a sales call list. And when you give up, you’ve already completed half a dozen forms - and you’ve given all that data for free.

If somebody does ever complete all of the forms, they get told the laptop is now out of stock - but here’s a free £50 voucher for Amazon.