What is the ruling on those who work in restaurant franchises that do not sell alcohol, and who receive their salaries from the revenue of their restaurants, knowing that the revenues of all franchises (including those that sell alcohol) are deposited into a single bank account?

Working in agencies that do not sell forbidden things is permissible, even if they belong to a company that has other agencies selling alcohol, especially if each branch is financially and administratively independent. Its ruling is similar to working for an owner of mixed wealth, and dealing with him is not forbidden according to the most authoritative opinion.