Every WinRed donation page tells you what campaign or committee is receiving money from that page.

That sure is telling... Technically I'm sure they are "receiving money", but note that it doesn't say "receiving ALL of your donation" or even "we take a small processing fee to cover the necessary overhead for internet/servers/payment processing but all the rest goes to your candidate". I'm ok with a processing fee to pay for the convenience and hopefully the security and guarantee of where the money goes, but I doubt that is happening here.