If they are charging for features, those features are a business, even if its a nonprofit business. There is also precedent for the IRS to consider it unrelated business income and to make them pay taxes on it, but that seems to be a huge grey area in US tax law.
LOL. What US tax law?
See for eaxmple the Mozilla IRS dispute as an example. Mozilla resolved this by putting their money making endeavors into a for profit org, which is in turn owned by the nonprofit, but the for profit org pays tax on their income. https://www.irs.gov/charities-non-profits/unrelated-business... See also
My point is that this administration isn’t really doing much enforcement.