What he's saying is, like, if you had a tea shop on a street that didn't have any other tea shops, you're the only one, and then across the street a new tea shop opened, well, you can say, oh, that tea shop over there, they're stealing my business.
他的意思是,如果你在一條街上開了一家茶葉店,這條街上沒有其他茶葉店,只有你一家,然後街對面新開了一家茶葉店,那麼你可以說,哦,那邊那家茶葉店搶了我的生意。