Hi Craig,
Let me chip in. I work as a Sr. Solution Consultant for Adobe.
It is not possible to transfer published Publish Online (PO) files to other accounts. These will remain associated with your account (read: the used account when publishing). Some other Creative Cloud features, like Libraries or files stored online, are shareable. But specific, product based, services like InDesign’s PO, Adobe XD’s PO, Typekit, Spark and others remain account based. Plus you don’t have the ability to download the actual HTML locally, or host the files on your own servers. I know, it would be awesome though …
The only workaround that you might be able to use is to create a dedicated Adobe ID e.g. publishonline@company.com and use that to publish and store your documents. In the end it’s only a matter of logging in, opening your ID file, and clicking publish. I know that this sounds tedious but it’s the only thing you can do. So in case your personal account ever gets pulled or changed, it won’t affect the published documents. You’ll always have access to those.
Officially, Adobe doesn’t allow you to share accounts between multiple users. So every user needs to have their dedicated account. But in this scenario I’m assuming the same user will be using the PO account.
Again, this solution works only if your business is relying heavily on this, otherwise it might not be worth the extra cost. Up to you to prioritise this.
Also, remember there is a script to export your HTML from InDesign. Maybe you can use that to export the HTML and then host it yourself? Just thinking out loud here.
https://creativepro.com/exporting-from-indesign-to-html5-amazing-free-script.php
Good luck
Bart