I'm looking at the transaction fees right now and there are still things that I don't understand.
First of all, can anyone explain what causes such a sudden sharp rise in number of transactions? This just happened now.



During the least 15 minutes,, transaction fee is around 15-20 sat/vByte but someone just sent a transaction with 40 sat/vByte and then increased fee via RBF up to 80 sat/vByte and just right now, they increased fee up to 208 sat/vByte.
Here is the transaction: https://mempool.space/tx/78e35dc01f976166bab5dcc5089c2649c97427cd28c4bc0ebde55a0fcb23d87f
Just what the hell is going on?