Temporary use of remote nodes is useful in order to use Monero immediately (hence the name bootstrap), however be aware that when using remote nodes (including with the bootstrap setting), nodes could track your IP address, track your "restore height" and associated block request data, and send you inaccurate information to learn more about transactions you make.
Remote nodes are useful if you are not able/don't want to download the whole blockchain, but be advised that malicious remote nodes could compromise some privacy. They could track your IP address, track your "restore height" and associated block request data, and send you inaccurate information to learn more about transactions you make.
To be able to communicate with the Monero network your wallet needs to be connected to a Monero node. For best privacy it's recommended to run your own node. If you don't have the option to run your own node, there's an option to connect to a remote node.
