But with more node and pool support full-RBF, you could just perform full-RBF rather than using one of these acceleration service.
Look at the Viabtc transaction accelerator fee structure to push a TX and it doesn't make sense at all now with the full RBF implementations on nodes.
Binance Pool BTC Transaction Accelerator is relatively cheaper compared to ViaBtc but it's way more expensive than paying the actual fee even at the highly congested network status.
Also, I came across Turn non-RBF transaction to RBF enabled? thread and how to do it step by step which may be useful in case if someone used a wallet that doesn't have an RBF-enabled wallet and now can import it on Electrum and rebroadcast it with a higher fee.