Those walls really sucks. I see so many new people buy a coin for 3 sats thinking if I buy a million of them, sit on it thinking if it goes up to 300 sats they are good, until they realize theres a 30 btc wall in front of them and then they are stuck. I think I will use the term "Berlin wall" for small walls and "The Great Wall of China" for big ones.
The wall has been taken away. They don't last very long when someone fires one up.
But yeah it's easy to manipulate cheaper coins if you have some money behind you.