Accessibility would probably be the biggest difficulty that might be legally required through poorly interacting laws.
(Not to say that things shouldn't be accessible, but we've already seen good-will gestures ruined because of this case. Some university posts lectures online to be nice, forced to take them down because they aren't accessible.)
The federal government has a requirement by law (called Section 508) that requires agencies to provide people with disabilities equal access to electronic information and data. Agencies have teams whose sole job is to evaluate any software that is built or deployed meets accessibility standards.
(Not to say that things shouldn't be accessible, but we've already seen good-will gestures ruined because of this case. Some university posts lectures online to be nice, forced to take them down because they aren't accessible.)