Yes, you can publish an eBook on Amazon for free. You can either use the Kindle Direct Publishing (KDP) platform to upload your eBook, or you can enroll your eBook in the Kindle Unlimited (KU) program and make it available to Kindle Unlimited subscribers for free.
If you want to make your eBook available to everyone for free, you can upload it to the Amazon Kindle Store using the KDP platform. To do this, you'll need to create a KDP account and then follow the steps to upload and publish your eBook. Once your eBook is published, it will be available for free to anyone who wants to download it.
If you enroll your eBook in the Kindle Unlimited program, it will be available to Kindle Unlimited subscribers for free. Kindle Unlimited is a subscription service that gives subscribers access to a library of eBooks, audiobooks, and comics. When you enroll your eBook in Kindle Unlimited, it will be available to Kindle Unlimited subscribers for free borrowing.