Pro-tip: these "services" are all rubbish. If you could circumvent their privacy controls that easily, it would be a pretty significant issue for IG and Meta. The way to view private IG posts is to connect with the account or have the login credentials to the account. Anyone telling you there's a secret back door is shoveling horseshit. (A secret back door that random internet users can access, anyway.)
Hacking
This is the community for all things hacking and cybersecurity, try keeping it legal. That said I don't take any responsibility for anything that happens/comes from this group but I will try being the best mod that I can to prevent anything from happening.
The pages i posts are “hacking” tutorials, theres no online services ( I know they all are scams)..
Also theres those shortcut scripts which claim to only work if you already have the post links (unlikely) , seems legitimate to me..
https://shareshortcuts.com/shortcuts/2495-lucky-instasaver.html
Scroll until the paragraph just before “Getting Started”, it states it can download private posts.
And this one
https://routinehub.co/shortcut/11162/
So if these methods work and aren't scams, why are you asking about them? If they work then you have what you need? It might be worth keeping in mind that if a girl has their profile on private it's because they don't want people like you looking at their personal shit. Your time might be better spent trying to find a woman in the real world who actually wants you to look at her.
I came to the hacking sublemmy excepting expert opinion, instead i got average Redditor opinion.. greeaaat …👍🏻😑
Isn't possible to view private instagram accounts, you'll need to add them as a friend to view their content. 100% of blog post's & website's you'll find on this topic, are SCAMS....