Hi there,
Thank you for reaching out to us.
While I cannot directly comment on whether or not developers ticked the box to confirm encryption usage on their apps, I can at least confirm that the AdMob SDK is already using HTTPS for all inter-SDK calls (and is thus by extension, using encryption). However, I cannot assure the same for mediated ad networks; they might still be using HTTP for their ad serving capabilities.
In the meantime, I'll reach out to the rest of the team for their inputs on this concern and get back to you as soon as possible.
Regards,
Ziv Yves Sanchez
Mobile Ads SDK Team

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