Are there security benefits of "fake local memory"? I imagine a sandboxing arrangement where a rogue WebGL app can't hack your entire OS. Several applications

Are there security benefits of "fake local memory"? I imagine a sandboxing arrangement where a rogue WebGL app can't hack your entire OS. Several applications (a) opencl servers - just fill an extra slot (b) eGPU over thunderbolt (c) a drop in GPU for Risc-V boards (sans ARM's Mali)