Actually I would like to redact my original statement that “100% Privacy” is a giveaway for a bad service. Notesnook uses that terminology, and a lot of other apps do use that term as well.
As far as I know no privacy service or software I use or recommend makes the claim of 100% private or secure.
To me, it raises my hackles when any company projects a false sense of “100%” private/secure/anonymous/zero risk/etc, but it is different if a single purpose end-to-end encrypted app like notesnook for example makes that claim (assuming that they do), it is at least not outright impossible in the context of an e2ee app where everything is encrypted/decrypted locally on your device only.
But for a WEB BROWSER to claim 100% privacy–which is not even theoretically possible in the context of a browser & the open internet–is especially egregious and an outright falsehood, and shows they are either being extremely disingenuous in their marketing or are extremely naive. Carbon Browser or any other Browser is not capable of making web browsing “100% private”
(And I am extremely skeptical they are capable of living up to other dubious statistics they throw around like being 300% faster than other web browsers or “saves 95% of your (mobile) data”)