All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu 'alyhi wa sallam, is His slave and Messenger.
What you asked about is simply a hiring contract to work in this company in order to surf some websites in return for a percentage based on the amount one invested at the beginning. This amount is not given back to him whether or not he works for them (i.e., it is non-refundable). There is no doubt that the company which takes this amount from the person is doing nothing but cheating and gambling, and this is forbidden in our religion. Allaah Says (what means): {O you believe, indeed, intoxicants, gambling, [sacrificing on] stone alters [to other than Allaah], and divining arrows are but defilement from the work of Satan, so avoid it.} [Quran 5:90]
Also, Abu Hurayrah narrated that the Prophet, sallallaahu ‘alayhi wa sallam , forbade selling by throwing stones (i.e., by lottery) and from selling that which is unspecified or unclear. [Muslim]
Selling that which is unspecified or unclear is any sale in which the product is unknown, and may not be sure to get the goods or not, so this is nothing but gambling. Since this is forbidden in selling, it is also forbidden in hiring. The scholars have stated that, “Hiring in this context is like buying, as in reality the sale is nothing but selling in return for a benefit.”
Furthermore, it is not permissible for the company one works for to take any amount (i.e., from the invested money) in return for his work as a hired person in it, as the company deducts this money from the hired person without any right and without any justification.
Hiring, as defined by scholars is a contract on things from which one could benefit in return for some money. For this hiring to be valid, the same conditions as that of a sale have to be met; which is that the wages should be known and pure, which one can benefit from and from which one is able to acquire. The benefit from this should be the same.
Based on the above, the subject about which you asked contains some prohibitions
1. The company pays a commission without benefit (in Islamic terms), but this is just to surf websites to show to the people who deal with them that their site is widely visited by surfers and this encourages them to buy their product through these sites. This is clear deception and is forbidden.
2. The person who participates in this company may have paid an amount for which he will gain something that is not religiously justified but simply in order to get a gain through that method.
3. The hiring contract is not defined, but it is a commission based on a given amount, and this may decrease or increase according to the choice of the customer. This could take the form of two sales in one sale. Abu Hurayrah said that, "The Prophet, sallallaahu ‘alayhi wa sallam, forbade two sales in one sale." [At-Tirmithi, An-Nasaa'i]
4. Having visited the website in question, it became clear that it contains other things which are prohibited according to Islam.
Based on all the above, it is not permissible to participate in such websites.
Allaah Knows best.