Vidxstream.com (https://vidxstream.com) has just rolled out their free video hosting deal. It is so easy to use. Create an account, upload videos, add hashtags for your categories to the description and done. They are using AWS and B2 servers so have great scalability as demand increases along with backups of all your videos. Your JSON file for Roku is at https://vidxstream.com/feed/rokujson.php?user=USERNAME They include adbreaks, tags, image creation or upload, and more. I switched over my feed last night and moved over 40+ videos in under an hour. They are also working on a payment model in Q1 2019 that will pay for views on the videos.
I have now been using them for hosting a little over 1 week and no issues. No more FTPing videos to my server or creating thumbnails either. This site is great for simplifying roku feeds. https://vidxstream.com