What is the ruling on profiting from a website that displays advertisements in two ways: first, by viewing daily advertisements, and second, by purchasing shares for $5, from which the buyer earns $2.5 after 30 days, with the possibility of withdrawing only 70% of the profits and purchasing new shares with the remaining 30%?

If the advertisements are permissible and free from promoting prohibited things, then clicking on them and browsing them for a known fee is permissible, as long as there is no deception of the advertisers.

And purchasing a share from a company such that the buyer receives a daily profit of varying value is permissible if the company invests the share without guaranteeing the capital.

There are matters that must be noted: 1. Investing in shares has regulations that must be adhered to. 2. Preventing the participant from withdrawing a percentage of the profit during a specified speculation period of one month is acceptable, but an absolute prohibition is a فاسد (invalid/corrupt) condition. 3. If the meaning of the share's expiration is the end of speculation by the end of a specific month and the distribution of profits, then there is no harm in that.