There are small burger restaurant chains in Canada that grind their meat on the premises. Burger's Priest (they used to tout this, but since the franchising push, this link is the only mention about grinding their own meat - https://www.recipeunlimited.com/en/franchising/burger-priest...) and Holy Chuck Burgers - https://holychuckburgers.com/.

Some meat sellers mechanically tenderize (blading) their cuts of beef. This may cause E.coli on the surface of the beef to enter the interior of the beef. Costco was linked to E.coli cases in 2012 due to this practice. See https://www.consumerreports.org/cro/magazine/2013/06/has-you...