https://ico.org.uk/for-the-public/the-children-s-code-what-i...
Then you look up what the actual regulation says and it's hundreds of pages of pure legaleese (over 100 pages for GDPR, over 300 for Online Safety Act), that you'd need to hire a team of lawyers to parse and interpret to make sure you're not breaking any of the regulations therein.
Maybe, you hope. Unless you've read (and understood!) all of it you can't say this with certainty.
In all likelihood you trust a 3rd party company like Intuit and their team of lawyers to tell you what actually applies to you.