Something like that. Was mostly speculation (ba dum, tisch!), but thinking about it further, it seems like the transaction fee is too high for it being high volumes of individual transactions. Looking up the number of transactions on BCH, it seems like the volume per transaction must be much higher to get this overall volume, because the number of transactions is an order of magnitude smaller than bitcoin (~10%) [1]

[1] https://bitinfocharts.com/comparison/transactions-btc-bch.ht...