Other drivers of Meme stocksThe U.S. government flooded the nation with cash during the pandemic.  Many young people took this cash not needed and traded it in the stock market and cryptocurrencies.
This excess cash supported the higher stock prices and fueled further investment speculation.
Retail investors (ordinary folk) were flush in cash because they had cut their spending while maintaining their income. In addition, some had received $1,200 checks courtesy of the Cares Act. 
Robinhood Markets {HOOD}- Introduced millions of young investors to the stock market.  I have a Robinhood account and occasionally look at what younger traders are buying.  As for the popularity that accompanies meme stocks, it fluctuates. Just as much as there can be highs during times of high demand, so too can there be lows and massive losses!