Reddit provides a platform where regular users create the data. Moderators add value by ensuring the quality. Without any of these parties, there is no valuable data. Of course there is a cost in running the platform, but Reddit should avoid as much as possible charging users and especially moderators for using the platform.
Then there are search engines and 3rd party apps. They also add value. Search engines use the data, and in return they attract new contributors. 3rd party apps also attract regular users, and by providing a better experience make sure that the regular users stay active for longer. They should not be charged more than is required to keep the platform running and is reasonable with respect to their profits.
LLM trainers do not fit in this picture. They use large amounts of data, but do not provide anything in return that is valuable to the users, moderators or platform. Therefore, I absolutely support charging them more for accessing training data.
Users of the platform who provide value in return should not have to pay more than is reasonable and required than to keep the platform running. LLM trainers do not provide value in return, and I support charging them more. It is unreasonable to not differentiate between 3rd party app developers and LLM trainers.