The ubiquity of NFC has made specialized hardware irrelevant for entire industries. It's set dressing for small businesses. The ruggedized enclosures and swiveling touchscreens are cute, but that's not a moat.
Their lead absolutely has shrunk. In the mid-late 2010s it was either Square, or a bevy of shovelware Windows POS systems loosely stitched together with a tablet for rewards and maybe grubhub. Clover and Toast are both regular sights in that space now.