Tor has a mechanism to prevent DoS attacks as much as possible, but it
requires adding the `--enable-gpl` parameter to the build. Use `tor
--list-modules` to verify the inclusion of `PoW: yes`.

I sent this to Fedora EPEL is supported, details
here:https://bugzilla.redhat.com/show_bug.cgi?id=2247828

Ref:

https://community.torproject.org/onion-services/advanced/dos/