The FloorBoard would be useful for people with limited use of their hands hence the inclusion in the Assistive Tech channel. For example, using the foot button for ‘Control’ means that just one finger is required for ‘Copy’ (Ctrl C). This avoids the necessity of using Sticky Keys (an accessibility feature in Windows designed to assist users who may have difficulty holding down multiple keys simultaneously).
It may even appeal to gamers where it could emulate foot controls such as car and aircraft pedals. Many games requite a forward and reverse action, and I must say I do find the WASD buttons a bit difficult to move quickly with in the heat of battle.
See https://www.instructables.com/The-FloorBoard-a-Foot-Operated-PC-Button-Pad/