Trump’s donation page has a box to click if you want your donation to be a monthly donation.
I have no idea what her donation page looks like and I refuse to go to her website to find out. ;)
I don’t want to go there either, but I bet it’s set up so that donations are monthly unless you specifically opt out. I further suspect the opt out mechanism is confusing and hard to find.
Sometimes these little boxes are to be checked if you DON’T want to make monthly donation payments. And they are generally overlooked.
The Hearst Corporation uses this trick for their magazine subscriptions.