so not something to care about? just a service to yoink some extra sats off impatient people?

_b_o_n_e_s_

Fee estimation have nothing to do with tx accelerator.
These are not new. They were available many years ago, form the blocksize war.
Here are the remaining ones from then
- https://www.viabtc.com/tools/txaccelerator 
- https://bitaccelerate.com 

DarthCoin

bitcoin

Binance Launches BTC Transaction Accelerator

if everyone launches these products how do we get good fee estimation? these are all opaque aren't they?