A couple workarounds, first the not-terrible one, second the terrible one:
- Just don't use the default "I agree..." text and checkbox. You can make your own button that says, "I agree...". Removing the checkbox (which of course doesn't actually do anything in the first place) also saves the user a click. Set the button to link to Page --> Current page (this avoids problems caused by setting it to the home page; someone could send a link to a specific page to someone else, and by linking to the "current page" the splash screen has no bearing on where the user ends up).
- You can't change the font color for this text directly by customizing a theme, but the different themes offered do present this text in different colors. If you had to have the default text for some reason, you could choose whatever theme gives you the font color you want (as long as that's white, black, or some version of gray, which is what the themes offer), then re-assign all your other theme colors.