No, not all laser projectors have voice control ability. It entirely depends on the projector you choose. For example, LG HU85LA and Optoma CinemaX P2 are two models that allow voice control using Alexa and Google home.  Since it is pretty common to find remote control abilities among laser projectors, the voice virtual assistant feature becomes more noticeable on the projector. Therefore, only expensive projectors include such features that enable users to talk to them.