That depends on what gait measurement entails to you. I would think so but Wikipedia says that it is just movement analysis.

Don’t forget that when you walk the length of your bones can be measured which can be used to identify you.

however it will need critical mass to attract content consumers.

My guess is that that’s the reason why OP wants to focus on one platform. Pick a winner and bring the traffic.

That’s a trap. It keeps the powerusers on Youtube instead of motivating them to seed a new platform.

Once the infrastructure for total surveillance is in place, it will never be dismantled without a revolution.

The entire point of surveillance is that all attempts at revolutions can be thwarted.

The USA will go to war with China to keep them in line. My assumption is that like Afghanistan it will be presented as an attack on NATO so the EU will be involved.

People may question the validity of that war which is ok as long as the sentiment doesn’t spread. With age verification those critical voices can be silenced easily.