Roku Has Limited Channels, All Paid Subscriptions

I've had Roku for a while now it’ll be a month on June 28, and while I like that it has so many streaming channels, my Roku TV model doesn't seem to be able to get all channels. Even though I look through the channel store and find some I'd like to add, I keep having the same issue: they don't work with my device. Also, I have to pay to watch some of the channels that work with mine, though I get that some premium content might cost money, it's disappointing to find this much restriction. wish that Roku would be more open about which channels work with each TV model and make it clearer what kind of subscription is needed.