How is it impossible when I'm literally using Dropbox, VS Code, Datagrip, Firefox, Bitwarden, Telegram on Linux every day? There is a huge amount of high quali

How is it impossible when I'm literally using Dropbox, VS Code, Datagrip, Firefox, Bitwarden, Telegram on Linux every day? There is a huge amount of high quality cross platform apps out there, and my Linux desktop is not only fast, it's also extreamly reliable and has no Microsoft or Apple inside. Dropbox can't make file sharing cross platform? That's frankly ridicolous.