Note that we do not have any plans to release any Fawkes mobile apps, because it requires significant computational power that would be challenging for the most powerful mobile devices.
However, the app could send the picture(s) to a server which would run the computation and return the cloaked picture to the app.
This would also enable an industry where people handle online servers and subscription plans to cloak pictures. For example, this is what Nextcloud does on https://nextcloud.com/sign-up/: Nextcloud provides the software (and services companies directly, but you don't need to do that), and other groups provide the service to consumers for money (and have free tiers) on their servers or on a VPS.
On https://sandlab.cs.uchicago.edu/fawkes/, you argue that
However, the app could send the picture(s) to a server which would run the computation and return the cloaked picture to the app.
This would also enable an industry where people handle online servers and subscription plans to cloak pictures. For example, this is what Nextcloud does on https://nextcloud.com/sign-up/: Nextcloud provides the software (and services companies directly, but you don't need to do that), and other groups provide the service to consumers for money (and have free tiers) on their servers or on a VPS.