Bugcrowd has seen a significant increase in mobile app vulnerability targets over the last year, offering various public and private programs for mobile app bug hunting. A limited-time contest is being run from April 1st to June 30th, where every valid and non-duplicate mobile vulnerability submission will be entered into a raffle to win $1000, with additional entries awarded for each valid submission. Participants can get started by emailing Bugcrowd's support team, specifying their interest in testing Android, iOS, or other platforms, and may qualify for private mobile testing program invitations upon submitting valid vulnerabilities.