The new spying gold siphoning is just very underwhelming. It was probably or perhaps overpowered before but now it's downright pathetic and just not worth it. It went basically to being worthless. I tried it a few times in a few different cities, always one of the AI core cities but not the capital. The yield after 29 turns here (deity, marathon) represents not even a turn worth of your own actual income in extra gold. The image below was from a siphon run in the early renaissance era.
It might be that gold stealing now has moved into being more of a late industrial or modern era game thing but before that it's just pointless from a gold stand point.
Previously you at least got enough gold to upgrade or invest in a few buildings or to upgrade a couple to a handful of units.
I'm not sure but I found that if you leave it running over and over in the same city then it seems to get even worse, after the next 29 turns I got no gold at all. But I have not done any extensive research on that one.
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(edit) OK this is the follow up. I made zero gold here. It could be cause I was busted and sent back to the capital. Still it's weird as it doesn't say it was still in Roskilde I was spying. But the spy notification here makes it sound like I was trying to siphon gold from my own capital. Which I guess could be a thing, corruption. But it doesn't make sense from a gameplay sort of way. Still normally previously even if detected you got the reward, it even says it was a success yet I got zero gold from it. I checked by comparing the numbers between turns on how much gold I was making etc and I am fairly certain I got nothing from this. But I'm not absolutely sure, there is a lot of gold coming and going and considering how small the amount would have been it might have flown under the gold radar so to speak.