I see no problem changing the prices, based on an obvious unforeseen increase of expenses.
However, all existing free groups should be given at least a month to be grandfathered into the Oct 21st price of $10 month/$110 a year with
any new optional transfer request being an additional $110. This way existing basic/free groups could decide (within reasonable time)
to signup for premium before a price increase, or take the risk now to remain free, but might an even higher cost later with any
subscription pricing changes.
All new groups wanting premium or transfer services would fall under new pricing structure. It's not price gauging to cover new unforeseen costs. Anyone
reasonable would understand the huge influx of yahoo groups caused a large unforeseen cost to GIO, as well as a necessary new revenue stream to cover those costs.