My question is, why do these companies run ICO? Is there any need for it actually? Why don't they use bitcoin if they want to enter the cryptocurrency world?
Actually, ICOs are the latest method to raise funding for a business. To me, all these huge ICOs that are NOT existing companies or businesses have really no justification to launch million-dollar ICOs to collect so much money for such loose ideas on some whitepaper that may have takens days to write, with marketing stuff taking hours to write, and with an ANN post that someone else took 15 minutes to write.
REAL companies and REAL businesses have justification to launch, to raise more funds to expand and grow. They have a running operation and need more funds to move into the next level.