It's extremely unlikely that they'll IPO for anywhere near $100 billion, or even near their current valuation (for reference, the largest IPO in history is Alibaba with $25B). Their accounting practices most likely don't utilize GAAP, which is how they get around saying "we're profitable in the US", so I wouldn't be surprised if they were actually significantly losing money. Plus with the multitude of lawsuits against them right now, it's not hard to imagine they lose a good chunk of their valuation in the near future if the lawsuits don't really favor them.

They may IPO (if they are indeed profitable and don't want to keep looking for Series N style fundraising), although I doubt it, and if they did, it's definitely unlikely to be anywhere near $100 billion.