> That exactly what flat earthers claim.
I have no idea what this has to do with this discussion, and this just comes off as an ad hominem attack. Flat earthers claim that there's an economic interest in lying to them? And you think that claim is particularly genuine or even similar to this argument?
> You don't know if this person has nothing to lose
It is possible that they have some competing business and are trying to damage LastPass, but there's absolutely no evidence of that, nor any suggestion other than to double-check your credentials and your expected security if you are a LastPass customer. So, if they do have an interest, they're doing a particularly bad job of acting within it.
> Even if they have nothing to lose that doesn't mean they are being honest.
And we're not going to reach 100% certainty of any fact through discussion on a message board. It is interesting that some people spend a lot of effort trying to ensure this obscurity gets injected into the conversation, and it suggests that their own motivations should be questioned.
All in all, on the balance of apparent probabilities, there's more reason to trust this person than not. You can attempt to assail that logic if you like, but I would appreciate it if you stuck to the facts of the argument instead of kicking up dirt.