You need to grab the Duolingo APK from a source like APKpure or APKMirror and patch this file.
This is because the installed Duolingo app consists of multiple (split-)APKs.
Grocy is primarily intended for groceries but can be used for basically everything in your household. Every product gets a location and one can also add pictures, a description and a category. You can even print barcodes for each product.
Windscribe works for me. You can either use their software which is open source or create personal VPN configs on their site to use it with your distros network manager.
They will try their best to follow the law in the most annoying way. You can do it on your own but your warranty is gone and important security features will be ‘unavailable’ like fingerprint on iPhones with replaced screens or the introduction of ‘registered USB-C cables only’.
Sustainability of a business strategy? But wouldn’t that cost them those sweet short term gains?