LGPL will be great for MyBB!

[Firefox Wins]

LGPL: It was designed as a compromise...
The main difference between the GPL and the LGPL is that the latter can be linked to (in the case of a library, 'used by') a non-(L)GPLed program, regardless of whether it is free software or proprietary software.

• Open-source purists can remain as "pure" as they want to.
• Cooperation for mutual benefit will remain alive and well.
  and
• Businesses and competitive people can compete for profits as the use of MyBB grows.
  

This is a wise move for MyBB and a great time to be alive!