How to get NSO for free?

Could you please elaborate on the steps necessary to acquire NSO tokens without having to pay for them? Are there any specific promotions, airdrops, or other methods that have been successfully utilized by individuals to acquire NSO tokens for free? Are there any potential risks or limitations associated with these methods? Additionally, are there any ongoing or upcoming initiatives that may provide an opportunity to obtain NSO tokens without cost? It would be greatly appreciated if you could provide a detailed and comprehensive explanation of the various options available for acquiring NSO tokens without financial investment.