Yes it is. Image drop to $1.99 after a month. DC used to drop $1 after a month but then extended it to two (and now it’s indefinite). Marvel drop to $1.99 but do it after around 6 months or so.
Most of the Indies go down to $1.99 after a month but Valiant do the $1 drop instead like DC, Avatar take an age to do any discount like Marvel.
They all have their own strategies. There have been suggestions that Comixology/Amazon control the pricing, this seems to be nonsense from all I have seen. The publishers run different practices that are consistent internally.