It is abnormal activity but is it affected you and your transactions on ERC20 chain?
I check and see Gas now is 20 to 21 Gwei that is not different than the last weekend. Days ago, Gas dropped to 17 to 18 Gwei too. I don't say it is cheap transaction fee as it is about $0.8 to $1 for one transaction but you don't have to spend 200 to 280 Gwei like that user to have quick confirmations.
No, it is not affecting me, but I am trying to understand why someone would desperately want to have quick confirmations and spend almost all funds."