[someplaceguy]

> Also, loading a non-GPL module "taints" your kernel (this cannot be undone except through reboot) and tells everyone on the support mailinglists that you've loaded proprietary code.

Except that the Linux kernel falsely taints itself with the "proprietary" bit when a module with a non-proprietary, non-GPL compatible license is loaded.

But of course, not being GPL compatible does not necessarily imply that it's proprietary, e.g. the CDDL (as used by ZFS) is a non-GPL compatible, free software license (according to the FSF).

And furthermore, this is documented and intentional.