Author here. Let me first note that the site is 100% free, and requires no account to read anything. I only use the built-in Ghost blogging subscription for those who want it delivered to their email, but it is absolutely not necessary. That's the full and total extent of anything email related with the site. I have many readers who subscribe to the RSS feed, which is free and open and requires no email whatsoever.

I have been trying to get this unblocked for some time now. I've tried reporting it as a false positive, and so did the Ghost admins, through the Google safebrowsing report mechanism. I saw my blog listed on phishtank.net, but that site isn't accepting new accounts and I have to have an account to report a false positive.

Ghost admins recommended I use a custom subdomain, and it may come to that. Sorry for the inconvenience, this is very frustrating.

UBlock Origin is also giving me the warning on that domain.