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Brainscape may or may not be a legitimate service, so it's hard to speak to its safety. See this page for more information.
Their homepage may also provide more helpful information.
Update: we've found 18 more learning & education stores that currently offer website security & privacy and 1,042 online services that are offering website security & privacy . You can also view all 1,525 stores that offer website security & privacy across all categories.