The main problem with Scratch is this one: <https://lists.gnu.org/archive/html/libreplanet-discuss/2016-04/msg00012.html>.
I don't know if it was fixed (that is: if Scratch now uses HTML 5 and free/libre JavaScript instead of Adobe AIR/Flash). Interestingly, in the same topic, someone suggested us to direct work towards freeing/liberating the JavaScript used/recommended by Snap! instead (like Scratch, and which must-**not** be confused with the package manager of the same name), see: <https://lists.gnu.org/archive/html/libreplanet-discuss/2016-04/msg00015.html>.
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