I got an automated response from Rockstar today. Hopefully this means they will start helping out those of us who didn't partake in the cheating:
You are receiving this automatic update because you have an open GTA Online ticket in the Rockstar Games Support system containing terms related to in-game money, cash, funds, or bank account.
If this ticket is not about the January 15 GTA Online maintenance to remove modded in-game currency, please respond to this ticket and we will address other issues individually.
The adjusted account balances are the result of removing counterfeit money generated by cheaters. If you already spent some or all of the counterfeit money you were given, you may find that your account balance after adjustment is lower than it was before you received the counterfeit money - this is correct as you will be allowed to keep the items you bought. For accounts that would have been left with little or no GTA$ after correction, we added sufficient funds to continue playing and enjoying GTA Online, taking into account whether a player intentionally created and distributed counterfeit GTA$ or received modded money innocently.
Any unspent Shark Card funds that you had in your account have not been touched. If you spent GTA$ after you purchased a Shark Card, you can keep the items you bought but you will not be reimbursed the Shark Card funds that you have already spent.
Please note that our Technical Support Agents are not able to adjust account funds on a case-by-case basis. For more answers about the GTA Online Maintenance, please see: