My issue with these services is (and maybe this one is different) is that I have to run 3rd party software and extensions and I never know how long these companies/products will stay around.
Yeah as mentioned the tool allows you to do bookmark full-text search. It's open-source, so it will stay no matter what. We build for resilience and for us as the WorldBrain.io company not needing to stick around in order for the service to survive. We see ourselves as the stewards of this tool, not the sole benefactor or proprietor.
Hope it will be helpful to you :)