Hello,

The bookmarks synchronization will come eventually. But it will take some time... there is just too many things to do.
Regarding my cloud server - as I'm the only author, I can guarantee you, nobody except me has access to the cloud. That also means that I'm the weakest link in the chain - which means it's pretty strong chain :) as I'm a professional programmer with great skills regarding security.
But for the future I'm planning also end-to-end encryption to make things even more secure.

Regarding my income - this is very bad. I have almost none (as you can see in my Patreon page). I live from my savings from previous jobs.
But I do what I love and it's used by so many happy users (which is a great feeling!) so I believe the money will come somehow eventually.
Also soon I will bring back the Pro version and some of the new features will be available only for Patreon supporters. That should generate some income to help me keep this project (and me) alive :).

Best regards,
Juraj Mäsiar