There are no rules, everything is a situation.
Whether I let them know or not depends on the situation. In the road with plenty of room to pass someone who was holding his line well enough as I approached, I don't see a need to bother, or bother him. On an MUP, or when then I might, again depending on the situation.
Keep in mind that passing someone on a bike isn't something that comes up suddenly. You have time as you approach to read the cyclist and conditions and decide how and when you'll pass.
Any NO, I'm not bothered by an unannounced pass except if it's done at a particularly inopportune time.
__________________
FB
Chain-L site
An ounce of diagnosis is worth a pound of cure.
Just because I'm tired of arguing, doesn't mean you're right.
“One accurate measurement is worth a thousand expert opinions” - Adm Grace Murray Hopper - USN
WARNING, I'm from New York. Thin skinned people should maintain safe distance.