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..