Acting like they have the billions as liquid cash is weird.
IF, and its a big if, they would start selling their assets in order to liquidate their stocks, the assets would nosedive in value to fucking hell. Most of their wealth is smoke and mirrors. Most of them spend money by borrowing cash against their assets.
Tax them so they have to lend or sell some assets to pay their fair share.
Then i assume there is something wrong in the routes from your lan when returning traffic that got initiated through the internet opnsense. If you can see traffic hit the LAN network, all should be well on the way in.
Perhaps some sessions on the way time out due to low TTL. I've experienced drops of traffic when there are too many hops.
No clue. I guess they are the type that likes to have things overly complicated.