The interesting thing is, memecoins have developed their own target audience, they aim to the guy who wants to "play the investor game" by buying maybe 5 or 10 bucks worth of the last memecoin and hopes to make massive profits in the pumps
Most of them just want to earn quick money through meme coins but most of them you need to gamble to see which meme coin is better for your buck, but let's be real here the chance of you getting something on meme coins on first launch is really rare nowadays and most of the new meme coins out there are just the same for scamming people and run away with their money, so stay away from that.
That being said the line between memecoins and legit altcoins is a very thin one, a project may begin as a joke without a white paper or innovative characteristics, but by getting a big community behind it can find itself with more real use cases and better tech support
That's how they gather communities on memecoins, most of them know the memes and it's so easy to make them interested.