Its still a thing (as others have mentioned ETH) but its not quite the same as 2017/2018. Back then new shitcoins were popping up daily, along with a steady stream of coins that may be more profitable depending on what GPU you had. Those days are pretty much gone. A lot of those coins went to asic and there isn't the influx of new coins. Right now ETH is about the only game in town if you have a card with more than 4 GB of RAM.
Well we still have some new altcoins but no one cares much about them, we have conflux which is already topping the chart of the most profitable altcoins presently, we have ergo too which is a DeFi PoW algorithm coin, there is another too which is has a name like 🦊 Foxd or something like that, it was dumped months ago and now back with a vengeance