What are the best VPN services for conflict zones?

There has been a rapid spike in demand for VPN $($virtual private network$)$ services in Russia and Ukraine since the invasion began three weeks ago. People in both nations seek online freedoms as offline misery intensifies and want to see through the fog of conflict. A VPN $($virtual private network$)$ service creates an encrypted tunnel between users and the servers they interact with. This helps secure the traffic to protect people from being identified, tracked, and surveilled. According to an explanation from the head of research, Simon Migliano at Top$10$VPM$,$ Russians began seeking out VPN services before the conflict began but demand has accelerated as the conflict continues, and authorities become more repressive there.

Demand climbed $55\%$ on February $24$ but has hovered around $1,000\%$ higher throughout March. In part, this reflects a desire among many Russian people to continue using social networks and to maintain contact with friends and family in Ukraine. Demand for VPN services also increased in Ukraine, increasing $609\%$ at its peak, and as Russia massed troops on the border, people there had already begun to install VPNs on their devices.

Source: Adapted from Computerworld: What are the best VPN services for conflict zones?

Question:

Discuss any five networks that are used for various personal and commercial purposes. List the security concerns associated with each network has. Please use relevant examples and you may substantiate your explanation using related examples, diagrams, and or flowcharts.