I cannot go through all the platforms listed by the OP but, yes, they're currently being offered.
I don't doubt that. I do question whether they're passive investment opportunities based in reality or are really Ponzi schemes.
I wouldn't call it an outright Ponzi scheme. Certainly, there have been bad reviews about the platform but, well, each and every DeFi exchange that is gaining momentum right now has its own fair share of negative reviews. But overall, it seems to me that there is indeed passive income from this.
There is actually a very tight competition in the DeFi market right now. Uniswap, as we all know, has made incredible amount of success when it entered the market. Liquidity providers are enjoying high rewards. But it was even topped by PancakeSwap.