Meme coins are able to bring many money for exchanges espessally when there is a hype of meme coins. Even Binance list meme coins.
Binance looks at the market and check what people are interested in and they list it, this in turn generate trading fees for them. Imagine if trading fees are 0.5% per trade and a trading volume of billion is traded on 24 hours, and they have this new coins like 4 listed in a week, the volume will be there for atleast 2 weeks straight up, that's how they make money from this coins and save it as revenue generate. Don't be surprised they also pay market makers to increase the price so that more people will be having interest to trade and makes more money from traders.
If only Binance can do this same pattern for altcoins that builders spend daily commitment on Github to show the community they are working and doing everything fine, I'm sure that more builders will be doing everything possible to put the community at heart and build all kind things to improve the product but they don't and that's why you see projects are abandoned and teams move from one project to another, just recycle idea from one bull run to another.
They do know on how this business works or on how this industry works on which we know that the more hype that it gets the more money that they can be able to get and as a business then they cant really just that let that opportunity to come pass by on which its normal that they will really be listing out meme coins more often in comparing on which it was before on which this is really just that not shocking. Business will really that doing into the things on which they do see that they can make money and they wont really be caring about whether they will really be getting some negative sentiments towards their service that they are providing but since considering that they are already that established their popularity then it wont really be that much of a problem. Thing here is that you do really know on how to go with the flow and would really be able to make money.
They are listing too much meme coin? Thats business and its none of our business.

We've seen that meme coin market is really that becoming big when it comes to volume and community on which its just that obvious that these exchangers are really that interested on listing them
specially if the community is strong and having that extreme hype. So it will really be that just a very common thing nowadays.