Given how easy it is to enable RBF on a transaction, there really shouldn't ever be a reason to require a transaction accelerator anymore.
~snip~
There are still a lot of people who have heard about some magical transaction accelerators where you can speed up your transaction even if you have paid a minimal fee, and they are not too interested in the RBF option which actually does what they didn't even want at the beginning, pay $0.50 or even a little more for their transaction.
Which coin is Nano?
Because of low transaction fee, someone should hold altcoin instead?
It was one of the few projects in which I participated by solving captchas and thus
"mining" Nano coins, which were not even called that at the time (RaiBlocks). Although many things later went wrong when it came to that project, the fact is that the coin cannot succeed even when it has 0% fee and instant confirmation.