I'd argue that is a very simplistic way of looking at it.
There is always a narrative as to why a stock will go "to the moon". You say it's explicitly a pump and dump and it's not really, no. Look at GME, the idea was to restrict the float so that when the shorts got exercised, they would be trying to buy shares that didn't exist, creating exponential demand which would increase the price significantly. Not an impossible feat[0].
The "memetic" part of it is purely information exchange. That's all. If that's the barrier for entry for being considered a pump and dump, then I'd say anything which reports on a companys action could be a pump and dump. From Financial Times, to Bloomberg, to Mad Money, to StockTwits, to whomever else.
0: https://internationalbanker.com/history-of-financial-crises/...