I was speaking in general terms. But this is based on spam mails I've had in the past (in one case where I came across a very well crafted phishing site for Sky, I did alert the web host directly). Likewise when I report spam through Spamcop, Spamcop will often advise the web hosts of any links in the spam mail.
Unlike some, I don't just moan about the spam, I have a nose at it and see what's going on under the hood as it were.
I've reported a series of emails to Amazon as they were being sent using their AWS service. I can't say if the account holder is involved, but so long as the mails come through I will continue to update Amazon.
I would say that if you think the Bitdefender report is wrong, you can submit a report here:
You still need to deal with the Fortinet entry as well.
From their site your site falls into this category.
Websites or webpages whose URLs are found in spam emails. These webpages often advertise sex sites, fraudulent wares, and other potentially offensive materials.
As I stated before the site owners themselves are innocent parties who may be unaware that pages have been added, which is why I would advise you as the site owner to check through your site to see that it's clean and then contact Fortinet to have them check again as well.
Only use Helpful answer if your problems been solved.
The spam signature(s) you submitted has been removed. Signature: "gogowebspace,com" Submit Date: Sun, 13 Jan 2019 04:03:42 -0800 Update Date: Sun, 13 Jan 2019 05:53:23 -0800
The signature update may not be effective immediately on your network because of the Antispam cache. If you would like to have the update effective immediately or have any other questions, please contact your network administrator.