No, and they likely never will be. Kindle Unlimited requires indie authors to have their eBooks exclusive to Amazon, and for both personal and professional reasons, I am not comfortable with that. If you're looking for a subscription program similar to KU, I encourage you to check out Kobo Plus. My books are also available via library sites like Hoopla and Libby, and through other subscription services like Everand (fka Scribd). I run sales on my eBooks fairly often, and if accessibility or financial situations are still a concern, please email me and inquire about my eBook Access Review program.