fe80::
That’s a link local address [0].
fd8b::
That’s a ULA [1]
2003::
This one is a globally routable address (Global Unicast Address, or GUA) [2].
As you observed, link-local addresses are generated completely independently. ULAs and GUAs are self-assigned using SLAAC or assigned by a server using DHCPv6 after your host has seen a router.
For a GUA or ULA to be assigned, the router or DHCP server has to have a prefix delegated to it. A GUA prefix would come from your ISP. A ULA prefix would be configured on the router itself. If yours has one without you setting it up, maybe it does that by default?
[0] https://en.wikipedia.org/wiki/Link-local_address [1] https://en.wikipedia.org/wiki/Unique_local_address [2] https://www.iana.org/assignments/ipv6-unicast-address-assignments/ipv6-unicast-address-assignments.xhtml
Not sure about Maduro-owned funds, but I read yesterday about the Bank of England freezing access to a chunk of the Venezuelan gold reserve in 2018. That action has been going through UK courts for years.