Has anyone built a free product and later converted it to paid?

I'm sure there are many of those here who launched something for free and later realized that you were providing too much value and struggled to monetize. For anyone who has successfully or unsuccessfully monetized a free product (without using ads or other indirect forms of monetization), how did you go about it? Did you just one day decide to switch everything to paid? Or did you give up?

I would love to hear you stories!

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