I think that basically all concerns that are raised are invalid, because the person who posted them doesn't understand how SQRL works. See https://www.grc.com/

I think that basically all concerns that are raised are invalid, because the person who posted them doesn't understand how SQRL works. See https://www.grc.com/sqrl/sqrl.htm https://www.grc.com/sqrl/sqrl.htm for an explanation, which differs drastically from everything that is described in the post.