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The more recent the proprietary product is, the faster an open-source version will be developed. It tends to be one year nowadays.
The unit (in days) is the TTOSA: Time Till Open Source Alternative. It is established on the first commit date.
About the data:
Two things become clear with this chart: first, there is an explosion of dots after the mid-2000s, and this probably is correlated with the rise of the Web and subsequently the GitHub era (GitHub was founded in 2008). Second, the trend is downward.
But an open-source alternative is not directly of higher quality yet.
The final result tends to be that everything will be open-source!
There are two ways to compete in the software-for-sale market: support, hosting, and other or monetizing the database.
