bbPress.org

just tested and

add_filter( 'bbp_get_author_link', 'remove_author_links', 10, 2);
add_filter( 'bbp_get_reply_author_link', 'remove_author_links', 10, 2);
add_filter( 'bbp_get_topic_author_link', 'remove_author_links', 10, 2);
function remove_author_links($author_link, $args) {
	$author_link = preg_replace(array('{<a[^>]*>}','{}'), array(" "), $author_link);
	return $author_link;
 }
 

add_filter ('bbp_before_get_author_link_parse_args' , 'rew_remove_avatar' ) ;
add_filter ('bbp_before_get_reply_author_link_parse_args' , 'rew_remove_avatar' ) ;
add_filter ('bbp_before_get_topic_author_link_parse_args' , 'rew_remove_avatar' ) ;
function rew_remove_avatar ($args) {
	$args['type'] = 'name' ;
	return $args ;
}

seems to do what is required