The article noted that, for many American Jews, the financial sacrifices needed to ensure a full Jewish life is unreachable. This is based on information in a report issued by the American Jewish Committee.
Regular practices can also be expensive.
Those with low incomes cannot afford the multiple sets of dishes and the higher-prices supervised food associated with Kashrut. There are synagogue membership dues, religious schools, synagogue activities, etc. It is difficult. I am amazed at what is required just to maintain ourselves. I won't get into numbers, but I make a decent salary.