Thanks! You are indeed correct! After that inconclusive thread, I reported in ** another thread ** that I opened a case to Unity’s legal team to get the definitive answer, and the EULA is correct. If you’re freelancing for a company that requires a Pro license, you also need a Pro license. Apologies for my bad memory!
However, it’s still true that if you’re only providing builds to a customer (or Steam, or the App Store), then they do not need a Unity license, so of course you don’t need to match theirs.