I couldn’t find it in the documents.
This was the same question I asked a little while ago and this was what I got in reply
TLDR: As per my understanding, you will have the ownership but Google can use it for marketing purposes and that is why they are hosting this event in the first place
“As between Sponsor and You, You retain ownership of all intellectual and industrial property rights (including moral rights) in and to the information, in connection with Your Submission. As a condition of receiving the Prize, each Confirmed Winner grants Google, its parent, affiliates, agents, and partner companies, a perpetual, irrevocable, worldwide, royalty-free, and non-exclusive license to use, translate, dub, broadcast, exploit, reproduce, adapt, modify, rearrange, add to, delete from, copy, publish, distribute, publicly perform, create a derivative work from and publicly display, in whole or in part, Your Submission, app code, and any other materials or other recordings that may be made of or by You (including accompanying materials and features, any names, locations, performances and likeness therein) in any and all media, including but not limited to digital and electronic media, computer, audio, and audio visual media (whether now existing or hereafter devised), in any language, throughout the world, and in any manner, advertising, promotional, commercial or any other purposes, without further review, notice, approval, consideration or compensation to any Confirmed Winner or any third party in connection with advertising and promotion, including, but not limited to, the right to make screenshots, excerpts, animations, video clips and compilations available for promotional purposes.”
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