Praise be to Allah.
There is nothing wrong with these websites working as mediators between those who have skills and those who are seeking services, in return for a percentage of the earnings, according to the terms of the contract. This comes under the heading of brokerage and fees for services, which are permissible.
But if the website stipulates that you should have specific skills, or it is limited to working with certain countries, then it is not permissible to try to trick it, because that comes under the heading of lying and deceit, which are both prohibited, and because the condition of brokerage is that it should be done on the basis of mutual consent, and the website has not consented to making a contract with you.
According to the hadith, “Scheming and deceit lead to the Fire.” Narrated by al-Bayhaqi in Shu‘ab al-Eemaan; classed as saheeh by al-Albaani in Saheeh al-Jaami‘, no. 6725). Also narrated by al-Bukhaari in his Saheeh in a mu‘allaq report as follows: “Deceit leads the fire; whoever does an action that is not in accordance with our matter, it will be rejected.”
Based on that, you must contact the people in charge of this website and tell them the truth about your situation. If you are not able to do that, then you must leave this website, then you may register again with your true information, if you wish, and we hope that they will accept it.
And Allah knows best.