This is like money laundering.
When you raise tens of hundreds of alts, and produce some word salads, you'll attract some legit forum users as well.
Exchanges, casinos and mixers do that all the time. Their big customers are CP sellers, drug sellers, terrorists etc but it is your legit money that washes their huge dirty money.
I am not saying that Rainbowdude is a acc farmer or not even though the evidences that were provided kinda make sense. I just didn't look deep into it.
I am just saying what he could be doing here.