this can not be because of price because in this time frame the price has been more or less stable inside $9k range with the average around $9500. so there is no increased incentive for more miners yet.
Bitmain shipped their gear, there a lot of people confirming arrivals
S9s have 0.09j/Gh S19s are at 0.03j/Gh, basically, you could drop 10EH from the chain with old gear and replace it with 30EH at same power cost.
The hashrate might go up by 20EH but the revenue/costs/profits will stay the same.
they could have changed into another coin and mine more than what they could if it is compared to bitcoin right now. At the end of the day, it is getting a profit is the priority over all.
BCH and BSV have around 3-4% of the Bitcoin hashrate, just 1% of the miners switching to them would make those coins unprofitable for anyone.
Rewards per day:
BSV ($167,069.88 USD)
BCH ($223,610.88 USD)
drumrolls..
BTC ($10,283,158.18 USD)