It's not a deliberate thing......more a case of I like to maintain a consistent pace.
So for example if I'm doing 60mph on the straight and I come to a hairpin bend......I don't want to lose any momentum. So I just keep on going at 60mph.
Probably a legacy of small bikes in the early years, where losing momentum meant you were screwed if you had other bikes with you. Back then it was just one big race!
For someone behind it might look like I'm accelerating.....but I'm not. It's their braking that makes it look like that to them.
It's the polar opposite of the 100mph up the straight and 20mph round the bend types.