Zuckerberg is no visionary. He didn't create Instagram, he bought it.
Instagram was barely anything when Facebook acquired it - there was only an iOS app, barely 27m users and 0 revenue. It was a hugely controversial move to buy it for $1B and there were countless articles about how the acquisition made no sense and how Zuckerberg is making a huge mistake.
It's one of the greatest acquisitions of all time and a masterclass in strategy and execution.
All they've done since they acquired it is CLONE SNAP (aka stories) and add it to IG, and now they're just cloning TikTok because Facebook hasn't ever had an original idea.
They've built an entire monetization engine around it, made a TON of improvements around how media works, added several new formats, built a ton of anti-spam detection/eradication/moderation that works at scale and makes the product actually usable, launched in so many countries with language/accessibility support, and so much more that Instagram couldn't have done as a standalone company.
When Facebook bought Instagram, it was just a speck - it wasn't even a business. It's not even close to the juggernaut it is today.
There's a ton of stuff that goes into scaling products like this. If you want to have a rational conversation about this you have to go deeper than using all caps CLONE. You don't go from 27M to >2B users and from $0 to >$25B in revenue just...randomly.