What is the ruling on earning profit from online surveys, knowing that the company conducting the surveys (SMA Group) is known, and is earning profit from introducing other people to the company considered a type of usury (riba)?

There is no objection to taking a commission for writing questionnaires and answering opinion polls related to permissible products. As for multi-level marketing, it is forbidden if the marketer is required to pay fees or purchase a product, whether for registration, or to obtain a catalog or training programs, due to the presence of usury and gambling in it. The company (SMA Group) is forbidden to deal with, as it requires paying 30 dinars to join the work.