Same for US citizens also. After spending three months in Schengen area, must wait another three months from the last date of departure from the Schengen area before you can apply to enter the Schengen area again without a visa.
Digital nomads (Non-european, mostly US) in 2008 used stay three months in any of the 25 (san Croatia which is Schengen member now) countries and then go to a non-Schengen area (mostly nomads will flock to Croatia, Ukraine, Georgia, etc.). That's how the nomads discovered those countries and made them popular in the nomad communities. One of my friend bought a place in Kiev and did very good reporting in social media in early phases of the War when Ukrainian refugees were pouring into Poland and Hungry.