No, a factory reset only impacts that device. It does nothing to your Roku user account, so does nothing to any other devices on that account. When you reset the TV, you will link it back to your account and all your existing channels will be reinstalled. But you'll have to add any required authentication to any channel that needs it. That doesn't transfer from your account.
Dan Roku Stick (3600), Ultra (4640), Ultra (4670), Ultra (4800), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.