> There's also Patreon (which means ongoing donation in my mind) and Librepay (which I've heard of but never used... and is apparently also ongoing donations weekly/monthly/etc). Can't I just use a credit card or PayPal to make a one time donation for instance?

That removes nothing from the rest of your comment but note that you can actually make a one time payment with liberapay, and I believe patreon too.