GPL is open source. Open Source does not mean it is free in terms of money. It is free in terms to modify and not being held hostage by the company selling it.
Today if Microsoft suddenly increase price of all of its software by 10 times, you cannot do anything and pay them as your business depends on it.
In open source you acquire right to use and modify it and not being held hostage
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Hybrid models aren't open source. If there are restrictions on who can use the code or how they can use the code, then it isn't open source.
But a part of the software is "open source". For example, I know a google Analytics like called Matomo : matomo.org/.
You can self-host a server, but they sell a lot of features, it's backed by a company. The source code is available here: github.com/matomo-org/matomo
Open source or not ?
That github repo appears to be open source, it has a GPL license.
GPL is open source. Open Source does not mean it is free in terms of money. It is free in terms to modify and not being held hostage by the company selling it.
Today if Microsoft suddenly increase price of all of its software by 10 times, you cannot do anything and pay them as your business depends on it.
In open source you acquire right to use and modify it and not being held hostage