In purchasing so-called “.NET swag” from this store the money goes to the non-profit .NET Foundation. As an independent organisation, the .NET Foundation exists to foster open development and collaboration around the .NET ecosystem. It serves as a forum for community and commercial developers to broaden and strengthen the future of the .NET ecosystem by promoting openness and community participation to encourage innovation.
— Immo Landwerth (@terrajobst) August 13, 2017
Source: .NET Foundation, Twitter/terrajobst