Poorly run charities are plentiful. That's why I liked contributing at the office as a federal employee. They had a database of charities, one of the fields was how much of donations covered operating costs (Administrative and Fundraising Expense Rate, AFR) ...instead of flowing to the actual charitable interest.
Look up your own favorite charity (they aren't all there): https://cfcgiving.opm.gov/offerings
I looked up a couple AFRs to see how much was spent on overhead:
Sumaritan's Purse, a respectable 11.2%
Hunters Hope, 18.5%, not bad for a boutique charity
Red Cross, 9.2%