Sadly probably not. The GDPR fine can be "up to €20 million, or up to 4% of the annual worldwide turnover of the preceding financial year, whichever is greater" which would be around 26 million based on their 2022 revenue. The company has gathered over $1.3 billion in funding and was "valued" at around $10 billion quite recently.
And that's only around what a year of API calls would have cost for Apollo so clearly by discontinuing the API they are going to save that amount back in no time!
This is the comment I was looking for. A class action from European citizens, for example, under the European privacy law, would really be bad news for Reddit (and good news for the Internet)