Ruling on Consuming Prohibited Wealth in Islam

He works filling out survey forms in another country in return for a fee

He designed software using haram wealth; does he have to get rid of this software?

She used to take money from her father without his knowledge, and he does not pay her mobile phone bill. Should she return the money?

She did not pay the fee for the scan, so what should she do?

His friend who is in charge changed his job title; can he accept the increased salary that resulted from that?

She earned money by deceiving advertisers and invested it in a project

He give someone money to buy some land for him, and that person invested it and made a profit; is he entitled to a share of the profit?

He has old bills that he did not pay and he has not been asked to pay them; does he have to pay them?

Ruling on a worker using a low-cost transit pass that is exclusively for students