Is money earned from working online in the following fields halal or haram: 1. Clicking on and watching ads, with the possibility of hiring workers to increase profit? 2. Mediating between a service seeker and a service provider to choose the most suitable one? 3. Designing logos and products where the client chooses one design and pays only its owners?

As for profiting from clicking on advertisements, you can refer to Fatwa (definition) No. 99467. As for service brokerage (simsarah), it is permissible under two conditions: that the service be permissible, and that the brokerage fee be known to both parties. You can refer to Fatwa No. 138530 for more details. As for marketing designs based on the "like" system as a ju'ala (reward-based contract), it is a void and impermissible contract, because ju'ala requires the result of the work to be specified, and the condition of "liking" makes the result unregulated, which may lead to the designer's effort being wasted.