The WMF is notorious for its donation banners making wildly exaggerated claims about the state of the Foundation (it needs some money to be operational, it is however not by any real stretch of the imagination in financial trouble or losing its independence because it doesn't get enough money; they have a massive endowment that can run Wikipedia for the next 50 years or so, and major corporations already give money to the WMF to keep it in the air, making the statements those donation messages give to regular readers very deceptive), scaring people in third world countries into parting with their meager savings because they are scared of the WMF vanishing through deceptive language and in general their donation drives are extremely intrusive to the respective Wikipedias.
I understand that the Document Foundation just wants to bring donations to the attention of their users, but the WMF is the worst point to compare it to.