It’s not mentioned in the filing, so we can only speculate.
…on March 18, 2024, Nokia Technologies sent us a letter indicating they believed that Reddit infringes certain of their patents. We will evaluate their claims.
That’s all we’ve got to go on.
Seems a few people have gotten that confused. Article spent too much time rehashing the change in 15.0 before getting to 15.1 and felt like a typical ragebait article.
Still seems a little ragebaity, they don’t really have a lot of proof that Apple has intentionally disabled running unsigned apps. Their argument is that Apple changed the process for running in 15.0 and an app won’t start in 15.1, therefore the end of the era of sideloading. Personally, I would’ve liked more details on that part and less on history of 15.0.