It's not fine to use paraphrasing tool, still the content he posts is not his, just copied in a tool to scramble the words and pasted again, but it's more difficult to catch this king of activity, it's still plagiarism.
Yep, paraphrasing and text spinning is considered plagiarism as well and so its far from fine and it shouldn't be accepted as a valid bounty submission.
They break rule 33.
33. Posting plagiarized content is not allowed.[e]
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33. This includes both copying parts or the entirety of other users' posts or threads and copying content from external sources (e.g. other websites) and passing it as your own.
Question here is whether bounty hunters submit their work via google form. If that's the case, I don't think that rule nr 33 is applicable here.
many managers present themselves as anti-spam fighters and then set such a rule like weekly reports on the bounty thread. thus they themselves are responsible for generating spam. i'm even very suspicious that most even check all links on report to validate it.
That's another thing I don't understand really, why bounty managers force bounty hunters to submit their work via bounty thread instead just using simple google form. Seems like a double work, to make bounty hunters submit their work in the thread, and then manually update their data. The only reason I see is to keep bounty thread at the top, making it more visible for other bounty hunters.