Synology
"Synology is *much* worse. Their RT2600ac phones home for many reasons to many different servers. They do not explain what or why and you can not stop it either. Details here in the section Spying on the Router
https://www.routersecurity.org/synology.php"
I'm a bit baffled Syno is so bad TBH. In their core NAS market, they are probably the best security aware maker !
My venerable DS411, bought 7 years ago, still gets security updates, those days. Which other manufacturer is doing that ?
Also, seems bizarre they are going into the crowded and indeed quite messy home router business, now. Not sure they'll get there ...