Critically evaluate the website. This is the first pass of the bullshit detector and you can tell from a lot from just the website whether its a scam. If it uses terms like "Web 4.0" or other nonsensical buzzwords, if its unprofessional and has anonymous teams, stay away. Always look for a roadmap, compare to what was actually delivered so far. Always check the team, try to find them on LinkedIn and what they did in the past.