A few years ago I was in a Arma3 Milsim group that hosted their own server.

Back then there was no automated way to sync plugins so we installed syncthing and told all users to install it too.

We put like 50gigabytes worth of addons on syncthing and the users were so much happier because since 50+ people were using this syncthing connection, everyone could download with full speed from the others as in contrast to the 100mbit/sec bandwith of the HTTP server we formerly used.

And nobody had to care about checking versions anymore, the syncthing folder was directly synced into the Arma3 plugin directory