Every now and then I'll get an email from someone higher up in Wikipedia asking for a donation. I don't really mind a tenner but I don't know if it pads the pockets of corporate management or actual contributors. Also, are they really short of money or is this tugging at emotional strings a play at something else? I wish Wikipedia survives but there's a lot of projects I need to donate to and I have a budget.
I made an account and did a one time donation for $2.50. This removes the website donation banner. As long as I'm logged in, I do not see those messages. I get an email about donating once a year, possibly twice. Infrequently enough to be unsure of how often it has happened. If I ever see the donation banner on the website, I know I am logged out. So I can't answer your query about the corporate aspect but I can say that the heartstring tugging can easily be solved with a one time donation for a small amount. You can do a custom amount for a donation so theoretically it could be for $0.01 or your lowest fiat equivalent.