I tried kondo in my home directory, and it ended up scanning everything due to a symlink:

'Steam/steamapps/common/Proton 7.0/dist/share/default_pfx/dosdevices/z:' -> /

It was taking a really long time, so I ran strace and found that it was lost somewhere in .../z:/proc. I know there are symlink loops in procfs, and I think walkdir is supposed to detect loops, so maybe it would have figured that out eventually. Still, I don't think it's a good default to follow links, and other tools I know like fd-find and dua-cli do not.

Semi-related, you might also want an option for same_file_system, but that's less clear as a default.