It depends on your definition of rigged. There are many “provably fair” online casinos where they use hashes and user generated seeds that influence the outcome such that it makes it 100% verifiably fair but you will still lose over time because the house edge. If you call the house edge “rigged” then offline gambling is equally rigged
If you have a choice on what stonks you invest in: pick an index fund. Don’t go for single stocks.