Where do you see that? To me it looks like bandwidth is plan-wide. For example, from the FAQ: "If you delete your instance early and create another one, the free data transfer allowance is shared between the two instances."
Full quote from FAQ :
"How does my data transfer allowance work?
Beyond the free data transfer IN and between instances, every single Lightsail plan also includes a healthy amount of free data transfer OUT. For example, using the cheapest Lightsail bundle you can send up to 1 TB of data to the Internet within the month, at no extra charge. Your data transfer allowance resets every month, and you can consume it whenever you need within the month.
If you delete your instance early and create another one, the free data transfer allowance is shared between the two instances. Data transfer overages above the free allowance are charged at $0.09/GB.
"
I assumed that each light sail instance would get the 1 TB bandwidth. But, the FAQ seem to suggest that each plan gets 1 TB. I can't tell if I can provision one VM of each plan and proxy bandwidth through. Say for $5 + $10 VM costs, I get 1 TB + 2 TB bandwidths..
That sounds a bit vague to me, too. Does that mean I have to upgrade to the next bigger instance (with more bandwith included), or can I just create a new equal-sized instance before(!) deleting the previous one?