L&LD, because there are a lot more people using router than BitTorrent Sync, obviously. If security is a higher concern, I won't use BitTorrent Sync either.
It is impossible to fully secure a router, but I can at least do my best to keep possible attack surfaces to the minimum. A compromised router is more troublesome in my opinion.
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RMelin, I am aware of, and have read about the μTorrent's cryptocurrency miner when the news just came out.
Instead of avoiding a good software and hope the alternatives didn't do the same, you have the option to fix things yourself.
To make sure there are no hidden Bitcoin miners hogging your idle system resources — Open Task Manager, look for "EpicScale.exe". If you find it, first end the process, then remove it from registry and start-up sequence. Finally, delete the files, they should be located somewhere at "ProgramData" Folder.
If you have set up software restriction policy or application whitelist on your computer, you wouldn't have to worry about this kind of threat. The Bitcoin miner won't be able to install, even if you accidentally let it in, it cannot run.
Or if you have at least configured Outbound on your Windows Firewall, the miner won't be able to call back home.