It’d be really nice if the Bergamot translation project that Mozilla uses becomes big enough that it ends up being used in other apps as well. That’d be cool if you could get the engine as a mobile app and the apps could simply send a local translation request to it.
I backup the videos I transcoded myself on Google Drive (encrypted, Google can’t see the content), since I buy the extra storage anyway.
Bilingual MKVs (English and French (preferably Canadian French when available)) are kinda rare online, and they help me save some storage instead of having two copies of the same movie for each language.
Most open-source clients will by default have the option to block ads, which goes directly against the TOS and will be a quick way to get their API access shut down. This is why most open-source clients will avoid using the API in the first place, since they’ll get shut down. This means that connecting to a YouTube account is not an option.