If you do venture into the world of data sharing with YouGov Finance (no actual connection to the government) be careful how you add accounts for the points and rewards.
You get 500 points for each active current account and credit card, but only 100 for a savings account, and you can only add 10.
So to get to the 5,000 points mark, for a £50 gift card, I was adding 10 of my current accounts and credit cards, but messed up in the adding process by not deselecting my Santander eSaver, during Santander authority, so will now fall short of the 5,000 for the moment. Cannot add another account for another 92 days
This is no different to any free aggregator app/service which doesn’t have paid tiers (perhaps with the exception of those provided by banks). If the users aren’t paying for it, they will be using the user data to earn money.
From things said on other forums I know that Starling uses a non-standard API (relative to guidelines provided to the big banks) and this has led to delays in aggregators supporting it in the past. Perhaps Starling doesn’t provide access to Savings Spaces through its API, or perhaps these aggregators just need more time to add full support