Did they say your money doesn’t follow you to each island? I must have missed that. I think it would be cool if you could devote one island completely to science and another completely to security. Use those islands to research different tech trees for there respected missions and contracts.
I don't think they've explicitly stated either way (as they haven't with most things) but the feeling I get from the interviews that I've watched is that each island is a completely separate entity. Therefore when you start each island you start with what you're given, not what you had
In a way, it kind of makes sense to do that from the story point of view, because if the islands are set in different points of the timeline then you wouldn't realistically have the 2.5m from island 1 by the time you get to island 2 if island 2 was set 20 years before
having said that, they've said that dinos you unlock later in the game can then be used on the earlier islands if you go back to them, which DOESN'T make sense in the whole differing timeline thing so maybe money will follow suit
god I hope it does, would be awesome to make it feel like the whole archipelago actually belongs to the same company