All password protected drop has a little 'lock' icon on the top. Well, I'll try my best to keep the service running as long as possible. But I agree with you, it requires a lot of works to keep any services running in a long run.
It depends, there are 2 types of drop - public and private. Public drop will be available to everyone. Private drop is always password protected. 'Quick drop'(non logged in user) is consider as a private drop. You can only create a public drop once you created an account. :)
Timedrip lets you send timed message to public or friends, you set your own 'showtime', and your message can only be revealed on that time, a countdown timer will be displayed before your showtime.