With a thousand points, you barely notice the delay. With a million, you're doing a million distance calculations for every single query. On a phone updating the map as the user scrolls, that's untenable.
Each layer catches different attack classes. A namespace escape inside gVisor reaches the Sentry, not the host kernel. A seccomp bypass hits the Sentry’s syscall implementation, which is itself sandboxed. Privilege escalation is blocked by dropping privileges. Persistent state leakage between jobs is prevented by ephemeral tmpfs with atomic unmount cleanup.
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（九）放射性物品，是指放射性物质中放射性活度和比活度均高于国家规定的豁免值的物质。
（五）多次发送淫秽、侮辱、恐吓等信息或者采取滋扰、纠缠、跟踪等方法，干扰他人正常生活的；