Login without authority
There are some cases where you don't need Posting Authority on your apps.
Couple examples are https://hivesearcher.com and https://openhive.chat where use case and actions are off-chain, no on-chain operations or transactions are signed.
Hivesearcher and Openhive.chat allows you to login with Hive account and perform actions without any chain operations. This is perfect use case for off-chain applications. Essentially, making any Web 2.0 application Web 3.0 by using Blockchain for Authentication.
There are more benefits of using hybrid approach. Try these approach and let us know if you are able to secure your apps to the best of your ability. Giving people complete control over their keys while still allowing services, websites and applications to serve everyone in most secure manner.