The original issue to get Rclone added to Homebrew is here. Github user catap created the formula.
It’s actually in homebrew-core, not a user tap. Homebrew is similar to apt or yum in the Linux world, so think of this as being in the Ubuntu main or universe repositories. Every homebrew user, which encompasses every techie using MacOS, can install rclone without adding additional repos (called “taps” in homebrew terminology).
To install homebrew, run the one-liner on https://brew.sh/, then “brew install rclone” will do the trick. After that, any time you run “brew upgrade” rclone will be upgraded alongside all your other brew packages.