I'm a Roku newbie. I noticed that there are two Taiwanese channels. They are only 69 pence a month, wow, that seems too good to be true. One of the red flags to watch out for if you think something might be a scam is "too good to be true".
Is there a catch? Maybe they are going start charging my card for stuff in the small print? Or whatever?
You can go to the Roku Channel store on the web:
https://channelstore.roku.com/browse
From there, you can search for and find the services and get information about the developer. I did see one named "Taiwan TV" that is US$0.99/month from "LomitosCrew", which has many country-specific apps.
I suggest you log into your Roku account at https://my.roku.com. Under Device Settings, click on PIN/Parental control. Set a PIN and specify that it must be entered in order to authorize any future charge against your account.