The community version being free of charge doesn't make it open source. MongoDB is licensed under the Server Side Public License. The SSPL is NOT an open source license because it limits user freedom to use, modify, and redistribute the software. Since the license isn't open source, that means the licensed software is NOT open source. I don't know what eduCBA is, but they apparently have no idea what open source and the principles of gratis and libre mean.
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The community version being free of charge doesn't make it open source. MongoDB is licensed under the Server Side Public License. The SSPL is NOT an open source license because it limits user freedom to use, modify, and redistribute the software. Since the license isn't open source, that means the licensed software is NOT open source. I don't know what eduCBA is, but they apparently have no idea what open source and the principles of gratis and libre mean.