"Rent-seeking" is blatantly false. Warp is a piece of software that the developers are going to update over time. A subscription model is appropriate for goods and services where the buyers receive value over time due to the continued effort/resources of the producers. You might not want to subscribe to a service or pay for a terminal emulator (I sure don't), but don't lie about it.
"Rent seeking [...] is an economic concept that occurs when an entity seeks to gain added wealth without any reciprocal contribution of productivity."