Is it permissible to work in the business of domain names by reserving names and then selling them for many times their price, or by reserving names of companies or services before their launch to sell them later for large sums?

It is permissible to trade in website domains (dom-ains) as a sale of usufructs, and it is valid for the lessee to lease the domain to another, even if the owner stipulated that it not be leased. This is because the lessee owns the usufruct and is entitled to dispose of it himself or through his representative. It is also permissible to waive the domain for a sum of money, whether to the owning company or a new lessee, as long as the lease period remains. This is known as "badal al-khulu" (consideration for vacating a leased property). A condition for the permissibility of this trade is that the domain must not be leased to anyone who would use it for prohibited activities, such as churches, atheist websites, usurious banks, or similar, because that would be assisting in sin.