I tend to go to the left if on a footpath, but on the right when on a wider walking track, a dedicated cycle track, or a road. My objective is to face the cyclists and cars coming at me so they have to 'curve' around me. I feel it's useful to make them think about what they are doing, or should be doing and I believe I'm that much safer, and I like to look at them straight in the eye. But I wouldn't bet my life on it though!
If I'm on the left and cyclists or cars are coming towards me then I think, that if they believe that they can just carry on driving in a straight line they might not give me a thought? I do however change sides on some bends, especially those with high hedges.
I experience this 'problem' every day that I run, all of my routes also have one short distance on a narrow tarmac road. On one steep straight(ish) sunken section, however, I run in the middle of the road to force cars (in particular) and cyclists to slow down as they see me ahead. Nothing worse than the fast ones who think they drive better than Lewis Hamilton, for example, one small bridge at the bottom of this section has been demolished by these fantastic drivers 4 times in 2020!
The only time I notice that people can get really confused is on a shared pedestrian/cyclist pavement, some go left some go right, my instinct is to keep left.