Because no one has access to your Roku device without being physically present in your home. And even if they could get into your Roku, there's little personal information stored on the device itself. The little bit that's there (such as your WiFi password) is encrypted and simply isn't worth the effort to retrieve.
Your computer can be hacked from outside your network and used to access anything you have stored on the computer, including login information for web sites. And even if your computer isn't hacked, someone could attempt to access your Roku user account without even being on your network. That's why almost all web sites now use SSL security certificates, to prove they are who they say they are. It used to be banks and e-commerce sites were the only ones that bothered with SSL, but now almost every web site does. It's all in the name of security.
The forum software that Roku used to use allowed for remaining logged in at all times. But when they switched to this software (Oct 2019) that went away.
Dan
Roku Community Streaming Expert
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