anyone ever successfully transferred between online casino accounts?

I’ve been messing around with a bunch of welcome bonuses and promos lately, trying to keep things organized, but ran into a snag. I had a small stack sitting in one casino account and realized I barely use it since their slots aren’t hitting for me. Tried to see if there’s any way to transfer funds not bonuses, just actual cash over to my other casino account, no luck so far.

Is there some kind of workaround for moving real cash from one online casino to another, even if it means withdrawing to some e-wallet or using an intermediary? Or am I just wasting my time looking for a trick that doesn’t exist? Only asking because it’d be way more efficient than withdrawing, waiting for clearance, and redepositing every single time I wanna hop between promos. Anyone cracked this or is it pretty much a dead end?