Yes, RSPS are generally safe to play.
The growth and commercialization of the RSPS community have, as far as we know, significantly reduced the risk of fake servers with malware. However, we still recommend keeping your judgment sharp. Avoid playing on servers that don’t provide clear information, lack a proper website, or have no active community (forums, Discord, etc.).
Like any popular platform, some major RSPS can be targeted by hackers. To protect players, these servers must adhere to certain security standards, such as encrypted storage of personal information. We maintain close contact with server administrators to ensure these standards are met.
For more information regarding safety of RS private servers, we recommend you to check this blog article by Falchios.