[vosper]

Of course mishandling the IRS would be worse, but I wasn't comparing the brand damage of the two actions (though you seem to contradict yourself by saying "doesn't weaken" and then "a lot more fatal"). I was making a general claim that hosting important information or communication about your company off-domain weakens the brand of the company. I could imagine a worst-case scenario where putting great content on Medium actually harms your SEO, and you end up with Medium outranking your business in search results that you would really want going to your domain.