When you are hosting with someone else's platform, they are in control, not you. They can change the service, put limits on it, or if you cancel your membership your content is no longer available. For the long term, you want something under your control, in a format that works for you. While PDF can work in some cases, it's not easy to read on various size devices, so publishing text content as native responsive webpages can be better. Publishing workflows can be very specific to your needs and may be complicated to setup. Having an interactive online magazine is not a trivial task. You'll need to explore options based on your budget and goals for the how the content should work and be accessible. InDesign is print/pdf oriented, and not the best solition for interactive online content.
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