Wow! Incredible! Huge Mitzvah!
It’s beautiful to see how Yidden are looking out for each other, and that helping another yid putting on Tefillin is not anymore something unique for chabad but is being done by all Yidden!
People always wonder “What’s the point? Why are these Chabad’niks standing on the street for hours to do a one time Mitzvah with people we may never meet again?”
But the truth is that each mitzvah connects a Yid with Hakadosh Boruch Hu – regardless of the person’s current “religious status”, and regardless if he will eventually become a Shomer Shabbos – he equally has a Pintele Yid which is needs to connect to Hashem! (and of course מצוה גוררת מצוה)
It’s really special to see how this idea is now being is understood by us all!

P.S.
It’s very important the Tefillin are worn properly for the Mitzvah to be done
(on the hand facing inward, on the head without chatzitza)
“וצריך שיהא במקומה הראוי, ואם… לא עשה את המצוה ובירך לבטלה” – קיצור שולחן ערוך י’ הלכה ג’