It's in the TOS:
Answer - ASR owns the rights, but you also retain your rights.
AFAICT ASR would not be required to give you royalties for any further use of your posts.
e: Saw that someone else answered already, my bad.
Anyway, I think it's an alright idea to summarize long threads using AI.
However, I would still urge caution. I have been using an AI tool to summarize meetings at work. It works pretty well, but I still review all the output manually. Out of ~5 meetings, in one of them it reported the opposite of what we actually agreed on in the meeting. The rest of the time it's spot-on, but that's how it gets you - a false sense of confidence.
The problem with LLM-based summaries is they don't have any way to self-correct on factual information. And when they report non-factual information, there's no obvious sign that it's wrong unless you happen to know it's wrong. It cheerfully and confidently outputs fact and fiction alike.