making 2k a month on 50k capital by writing put options

I have a friend who is making 2k a month on 50k capital by writing put options

He says that It’s pennies in front of a steamroller, but stocks only go up so I’ll just switch to writing calls when/if I get assigned

''but stocks only go up'' isn't this ridiculous?… ''stocks only go up''..

By the way is this ''writing weekly puts'' a safer strategy to generate passive incomes?