Nothing could be more secure than privacy coins such as Ryocurrency, a project which is truly focused on privacy and decentralization. As far as I know, projects focused on these 2 things (privacy &Decenterlization) are going to survive in the end.
Privacy does not equal security
The use case of TemTum is national currency - we have talks MOUs everything around this - no nation is going to take a coin with privacy based in - privacy coins will be regulated out
If you want million of users using your token - it's not about privacy, it's about the technology to allow anyone to use it and be fully compliant with the laws and regulations