Anecdotally, I find if I go to Lyft, then go to Uber, and back to Lyft 30s later, I often get an updated decreased price.
If every time you notice it's higher than usual, you do this, and notice the price eventually decreasing... but you never switch apps when the price is already normal, and you never not try the other app if you wait... in other words, might just be confirmation bias.