My employer creates Simscape Multibody[0], which does kind of similar stuff, but it's more targeted towards business/research needs. This looks like a more fun variant of it!
This looks very interesting to me, and I'm sure my fellow colleagues would love playing around with this.
Simscape Multibody looks very cool and I can see how it and MockMechanics could complement each other: create something super fast without any real physics considerations on MockMechanics just to brainstorm an idea, then once you have narrowed it down, model it properly with Simscape Multibody.
This looks very interesting to me, and I'm sure my fellow colleagues would love playing around with this.
[0] https://www.mathworks.com/products/simmechanics.html