DMs are exactly what you expect, like private email. Every service has some form of this.
Reddit chat is real time, designed for shorter messages and real-time communication.
The other difference is that everybody uses Reddit DMs and nobody uses Reddit chat. I have my chat turned off as do most others that I talk to.
So this is yet again another example of Reddit management not reading the room and forcing the use of a system people generally don't want.
Nope. There are a great many species of mosquitoes. The only one that bites humans is the female of one specific species. Those little fuckers have killed more humans than any other cause of death, second only to being killed by other humans.
There has been some fairly extensive studies and it has been conclusion that even if we extincted that specific species, it would not cause major ecological changes.
Currently the best way we have of eradicating them large scale is by genetically modifying and releasing huge numbers of them that are non-fertile. If this is able to specifically target that species and not kill others, it could be a more effective answer.