In your opinion, how promising is crypto staking as a way to generate passive income in the increasingly competitive digital asset market? Which strategies are the most effective for long-term investors? While staking allows for rewards for holding coins and contributing to network support, it also carries the risk of liquidity freezes and token price fluctuations. Which strategies do you consider more reliable: classic long-term staking on large, proven blockchains like Ethereum or Cardano, flexible staking with the option for quick withdrawals, or the use of multi-tiered strategies, such as staking part of a portfolio for a long period while using the rest for more active operations, including participation in DeFi platforms? Also, how wise do you think it is to combine strategies like "restake" (automatic reinvestment of rewards) and "staking-as-a-service" to diversify risks and increase returns?