You've got Firefox and Brave. Edge + Chrome are based on the free software Blink engine, while Webkit is one of the only free software projects Apple develops and maintains. Who doesn't use VLC? Bitwarden is a popular password manager. About 50% of the world uses Android, which is nominally free software with some proprietary components. Blender is the world's most successful free software project. A surprising amount of mainstream artists use Krita. People who download torrents are probably using a free software BitTorrent client like qbittorrent, Deluge, or Transmission, rather than uTorrent. A lot of people use the uBlock Origin extension, which is a free software content blocker.

And hey, everyone who has played DOOM was playing a game released under the GPLv2 in 1999, minus the game data.

File hosting isn't really an issue of free software, because very few people will host their own cloud storage server. It's more about relying on servers to provide a service rather than software, which is a good and bad thing.

This is kind of a neutral point, but a lot of software has become services accessed through a web client (browser). This means anyone on any operating system can access the service so long as they have a browser, which evens the playing field for us SerenityOS and Haiku users :^).