Oh no. There’s nothing wrong. I think it’s just an inferior tool for the amount of ads they show everyone on the internet. I’ve met people who are overly enthusiastic about Grammarly (coz they’ve been biased with all the ads they’ve seen) and I think it’s overrated for what it is. People fall for overrated over-advertised products a lot and make bad decisions in the process. Reminds me of the paperlike screen protector ad on every other iPad review video. The product is not at all bad but considerably overhyped. What this kind of unhealthy hype does is that it creates a bad smoky atmosphere, which doesn’t let other products shine through even though they are equally good (in this case Quillbot is arguably better).

That’s said, if Grammarly works for you, then you should definitely choose it.