Action cam recommendations? (Europe)

I am looking for an action cam. It does not need to be a GoPro or DJI simply because they are so very expensive -- but finding alternatives is difficult, mostly because all those products are misrepresented on sites like Amazon. Some reviews reveal that the manufacturer offers free add-ons to customers who post 5-star reviews. That means I cannot trust any review at all.

Where can I find honest reviews? How can I choose a decent action cam without getting scammed?