Voltage.cloud is great for:

• Businesses: If you need to be highly accessible to receive and send payments, it's a really good option, unless you have your own highly reliable infrastructure at the office.

• New users: Spin up a node and experience Thunderhub and other tools available. Good for learning LN cheaply even if you intend to later run your own node.

• Developers: If you need multiple nodes for various purposes, including on testnet.

• Private individuals in developing regions: If your infrastructure doesn't allow running your own node, you may have no choice. For example, in some regions power or internet connection goes out often, and thus running your own node is painful.

• Frequent travellers: You may be living in a highly developed country but you move or travel a lot, and you may not feel comfortable leaving your node behind, or taking it offline and carrying it in your luggage around the world.

However, if you can, do run your own node. It's better for privacy, and sovereignity. Voltage.cloud or their service providers could be theoretically be ordered by a government to stop operations and they may have to comply, and in those situations your funds could be at risk. You would have to force close channels, and recover funds with your seed.