In economics, comparing a corporate investment round to a country's GDP is considered flawed. As you noted with your "16 months", the company is sitting on a $950M bank account that it will slowly burn through over the years. Comparing a multi-year pile of cash to a single year of national production distorts the scale.

You are basically comparing a nation's actual hard work and output to a speculative pile of cash. Even comparing corporate revenue to GDP is frowned upon by economists. A company's revenue includes the cost of all the inputs it bought from other companies (such as servers, electricity, and software licenses). GDP, by definition, strips out intermediate costs to avoid double-counting and measures only final value added.

You're also picking nations that do not produce much or have a very low population (Tonga only has 100k people), which pulls down the GDP due to how it's calculated.