What platforms do you use to get feedback on a website/ lander and so on? Avoiding typical answers like Slack, discord and facebook which it's full of fake profiles.
Personal search and viewing of several different platforms is probably the best answer here. If there is a specific thing in someone's business, it will permeate everywhere, regardless of whether it is something positive or negative.
Experience is crucial and is gained over time, and then it is much easier to recognize fake feedback. Even if you can't find anything about a service, it's a form of feedback. Nobody uses them.
If you have any doubts, you can always ask here for advice or someone's personal experience, If you have any doubts, you can always ask here for advice or someone's personal experience.