I think it is still possible to do it, but not on a large exchange, but from Dex to Cex, where the trading volume is not too large. But the problem is that nowadays it is very rare that there is a large price difference between Cex and Cex or Dex. Except for several altcoins that have just been listed, namely altcoins that are immediately listed on many Cex at once. Because the pump level in each CEX is always different. But still the risk is very high because we never know whether the price will remain high while we are sending coins to another cex.