In our world today, companies have changed hands, merged and collaborated so much that the lines are blurred about who actually makes the finished products. Most companies do not make their entire machines, they outsource "off the shelf" components that are already established in the markets.
At the consumer level, it is a free for all with very few regulations or guidelines. On the industrial level, the purchasing power is what dictates the higher quality of the end products. Generac has both a line of homeowner and industrial grade generators. The build quality and price points are entirely different.
B&S and Generac have had a long history of collaboration. They keep it buried pretty well from the general public.
One example:
https://support.generac.com/s/artic...rac-Portable-Product-Is-A-Briggs-and-Stratton