So far today I've seen 2 posts about people getting btc randomly in their wallet. Is it possible for wallet addresses to be almost identical except 1 or 2 letter/numbers? Instead of copy pasting the addy someone could make a simple mistake manually inputting it (very dumb idea). I think this is probably not the case but how could this happen? Are these people just lucky? Or could there be something more sinister going on? 3Btc is quite a bit to just accidentally send to the wrong addy.
Why is copying and pasting a dumb idea while you're lucky to not make a mistake doing it manually?