I don't mind people comparing such projects against Anki, this is natural since Anki is quite dominant in this space, but I feel like every criticism of Anki on that list was either highly subjective, exaggerated, unfair, or outright wrong and unkind (in a "one does not climb a ladder by throwing others off it" manner). Not saying this is what Fernando intended to do here, but his sharp opinion does come across a bit…
Using Anki every day for about half an hour (I'm a slow learner lol). Anki sucks, but it's good enough that there's no point looking for other apps.
Also "half an hour" != "slow learner", everything depends on the quantity, the difficulty and the chosen desired retention.