CZ is indirectly interested in promoting memes on the BSC network. As you probably know, BSC has already surpassed Solana by trading volume on DEXs, and it happened because of the meme hype that CZ provoked. Such hype around BSC also creates demand for BNB, and this is what CZ needs because he is one of the largest holders of BNB.
That's a good point you have made, he definitely wants BNB to go up, and even if he acts like he is not interested in meme coins and talk like he don't care and consider them bad thing, he indirectly supports them and make money too.
Why is that? I mean he don't have to do that, if he wants to promote BNB ecosystem bring some more cool project in it, like Solana is bringing, although BSC is so under-rated now, I mean in terms of incentives projects, I have joined a lot of project on BSC network but most of them did not gave good profit from their rewrad or airdrop programs.