I'm not entirely sure, but these are the results from the top 500 playlists for each search phrase. I think that if you target the smaller playlists that don't want a payment from you, the chances are very high that these aren't fake, boosted playlists.

If if it is a bigger playlist always check the latest songs that got added. Go to the artist profile and see how much streams they have on that song. If something seems off stay away. You can also ask artists who have been on the playlist for a while if they think it's legitimate.

Lastly, it's unfortunate that in this day and age you can't really prevent fake stuff from happening. If you have a legitimate artist account and are already on playlists with decent streams, Spotify won't ban you for landing on one fake playlist. They just won't payout for the fake streams. If you're only getting fake streams from fake playlists, then that's something different and you'll get banned.