Charities are a perfect example of non-manipulative links. This is never something you would seek to do for a link alone, but if you’re already actively contributing to a charity or event, there’s a chance to secure a link. Link building is often just optimizing existing opportunities and ensuring you’re securing the links you deserve.
For example, Loot Crate partnered with Operation Supply Drop to donate many of their products to military members and their families.
There is an article on Operation Supply Drop that highlights the great charity work the company is doing, and it mentions Loot Crate’s contributions as well.