Many doctors and scientists say it isn't. People and pets have already become sick where it's been installed (see 1, 2, 3). Despite increasing worldwide opposition, warnings, and lawsuits (see 1, 2, 3, 4, 5) companies are still installing it anyway. Most would consider that to be very risky especially considering that
Telecom companies have been warning investors for many years that they may eventually be held liable for harm caused by their devices and transmitters. In fact, there's currently a Smart Phone Class Action lawsuit due to phones exceeding federal RF safety levels.
So it's really not surprising that Swiss Re has classified 5G as a "High Impact" Risk.
The top five emerging risks in our SONAR 2019 report are digital technology's clash with legacy hardware, potential threats from the spread of 5G mobile networks, increasingly limited fiscal and monetary flexibility by central banks, genetic testing's implications on life insurers, and the impact of climate change on the life and health sector.