First of all, let me introduce you to travelmate.
Second, in cases of multiple uplinks it is often necessary to do policy based routing.
Third, interfaces captive and wan are both dhcp on the same interface, which messes up things. Keep one of them and prefer to use peerdns, as the hotspot might not let you query external resolvers.
Fourth, let's verify the routing:
ip -4 addr; ip -4 ro list table all; ip -4 ru
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