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It's an unbelievably valuable resource to humanity.

I do not deny that it is great for learning. Just is that learning recognized by anyone?

Or is it something only worth doing for personal fulfillment?

Coursera has a very heavy pitch about employability.

There is no perception of scarcity in the market of online certification so they carry little weight.

That doesn’t mean you don’t gain valuable knowledge but it’s unlikely to be in demand from an employer.

There could be scarcity if few people could successfully complete the certification. The problem is whether it is trustworthy though.