@Jan *****************
keyword there is "maximizing".
They don't want people trying to live here long term on visa exempt/tourist entries.
If you maximize even one border run with a 60 day entry and 30 days extension, you've already spent 180 days in Thailand.
They are very likely to question you about being just a tourist at that point.
On the other hand you can enter many times a year without ever having any issues, if your travel history shows you are in Thailand for shorter periods. Not maximizing your stays and extending them.