Good routers show usage by device. I don't know, why the sibling answer is dead, but ubiquity routers seem to have this feature. Mikrotik and keenetic are other routers, that are capable of that. Maybe recent Fritzbox routers too.

That's surprising. The last time I ran a Fritzbox was in 2012 and I think it was capable of doing that. I think virtually all routers showed these kinds of statistics back then. I'm on OpenWRT the last five or so years, so I haven't kept up, has this changed?

On Fritzbox you need to enable it for each device individually. Good thing I saw this post, as I wanted to check out what some of my appliances are doing and enabled it for a few of them a month ago.