The early exploiters could have bailed and set their sights on farming in other systems where the APR is higher. With the inflation cut and slash to APR, they aren't as interesting in exploiting the CubDeFi system and bailed for easier and faster money.

I think this is #1 reason
Those who left - are here for a long run.
It will be no so simple to knock out any CUB from their paws