- Offer bonus that cannot be copied (access to private FB group, Zoom mentoring, etc...)
- Use the illegal copies as marketing for yourself: put watermarks all over the content with your own web address that are difficult to remove. Mention your web site in your videos, etc.
Often people sell books at a loss just to get their contact information:
- https://supplygem.com/clickfunnels-free-plus-shipping/
- https://www.clickfunnels.com/blog/mechanics-behind-free-plus...
that is, see what they're doing better than you, and copy it.
another option is to ping them and offer a deal - you let them sell it and take a cut, all legal.
another option is keep selling your version and they sell theirs and just try to concentrate on building up your brand - which maybe the real purpose of selling an e-book/etc. - so that you can build your email list, etc.
just some ideas. must suck.