What are the downsides of Roku?

Can you elaborate on the potential drawbacks of using Roku? Are there any issues with its user interface, streaming capabilities, or device compatibility that users should be aware of? Additionally, are there any concerns regarding Roku's data privacy practices or potential security vulnerabilities that could impact users' experience? It would be helpful to gain a comprehensive understanding of the potential disadvantages of Roku before making a decision to invest in or use the platform.