What is the perfect example of freemium model?

I'm curious, what stands out as the pinnacle example of the freemium model in today's business landscape? Is it a tech giant that offers basic services for free while unlocking premium features for a fee? Or perhaps a gaming platform where users can enjoy the CORE experience for no cost, but unlock additional levels and customization options through microtransactions? I'm eager to understand the nuances of this model and how it's been implemented to great success.