The short answer is - no.
Here's the longer explanation: In order to run these campaigns online and help provide a tool that remains in compliance with local laws, the campaign that you're running is technically a sweepstakes, where people can enter by donating, and not a raffle, where people have to purchase a ticket to enter.
These campaigns largely function in the same way. One of the key differences is that, with a sweepstakes, people don't technically have to make a purchase to win. (If you've ever come across a 'no purchase necessary to enter' clause, this is the reason.) People can find this free entry option by looking in the official rules / additional rules & guidelines at the bottom of the Giveaway page.
Legally, our understanding is that it needs to have the same weight as any other entry. Our hope is that most people enter by donating -- and that's exactly what happens on average. (Around 98% of people enter by making a donation). Still, people are able to enter however they choose, and free entries can't be deleted. The only time that we're able to undo a free entry is if a team-member or administrator of the nonprofit organization entered by mistake. If that happens, feel free to reach out to our team through the Contact Us link at the top of the page.