For 2.84 I add this code to functions.php and it seems to do the trick;
$filters = array('pre_term_description', 'pre_link_description', 'pre_link_notes', 'pre_user_description');
foreach ( $filters as $filter ) {
remove_filter($filter, 'wp_filter_kses');
}
The theme developer designed the theme in order to make money by selling the links. If they can’t make money that way why should they bother making nice themes? If you don’t want the links don’t use the theme.
@dyske
Checking back over my last user registrations I found the four preceding the admin one were
MikeWink
Miriam
Adrianq
darrenkisak
which all flagged as spammers with a search.