I've been using it for years and never noticed anything. But I think it's a good idea as a precaution to leave only things like landing pages in the IO domain,

I've been using it for years and never noticed anything. But I think it's a good idea as a precaution to leave only things like landing pages in the IO domain, and setup the API or dashboard app in a separate .com domain. I remember reading in some comment here on HN I think that their support does not reply on weekends.