Is there a reason you didnt reach out to me to ask about it?
You are correct it only allows people to see posts they already have permission to see. It would be no different than subscribing to their RSS feed which is also public.
I should point out we specifically implemented it to protect the privacy of our LGBT users who came to me in private and asked for it some time ago. Since we federate with GAB and have a significant LGBT community here many of people int he LGBT community here use it as a way to watch GAB account so if there is any danger they can relay to others, as sort of safety/surveillance net. However when they followed GAB users it would notify the GAB user and put the user at danger of retaliation. So the subscribe feature was to protect them, and their privacy.
@LuigiEsq@mastodon.social @infernusgoatus @dankwraith