If you prefer to run something like this locally while maintaining 100% ownership and control of your files here is my android app I wrote 6 months ago: https://play.google.com/store/apps/details?id=com.luksapps.i...
It uses the best open model on the market to run up scaling (multiple versions of Real-ESRGAN) and runs them in 10s~up to few min per photo on relatively modern mobile phones. This is a free ad supported versions. There is also a paid version with no ads. Both versions can be used while 100% offline.