I use joplin with joplin server running through a reverse proxy in a docker container. I love it. It also supports encryption, so you could use a more convenient service like Google drive and still be assured of your privacy.

Its app on a specific platform? Or do you mean the entire service? Seems weird that they would sunset their only product.

Tidal has no official Linux app, which is shocking considering their demographic. But a hero has made an app that gets pretty close. Under the hood it’s the web client with some add-ons to support full quality streaming. The user experience is generally fairly close to an official app.

I used soundiiz to convert all my content over, and of probably over 10,000 songs there were less than 100 unavailable, so library isn’t a concern. The increased quality is nice, but the big reason I choose tidal is that instead of doing unnecessary stuff like podcasts they pay artists better. As much as 3X according to some things I’ve read. I have not verified those numbers.