Yes, for standard users. You cannot run 8 cameras on a DS220+ for free.
But... You can buy a Synology DVA1622. It is more expensive upfront ($600~), but it includes 8 licenses. If you need 8 cameras: synology surveillance station license free
In that specific case, the DVA series is effectively license free. Yes, for standard users
If you need more than 2 cameras, you generally have to buy License Packs. In that specific case, the DVA series is
This is a major source of confusion.
Yes. Even generic ONVIF-compliant cameras (Amcrest, Reolink, Hikvision, Dahua) still consume a Synology license. The "free" allowance applies to any camera brand, not just Synology’s own.
The single exception: If you use a Synology Network Video Recorder (e.g., DVA3221) bundled with licenses, those are pre-paid. But for a standard NAS (DS220+, DS923+, etc.), every third-party ONVIF camera uses one license slot.