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Live translation except by machines is impossible especially for say Pekora who talks so fast even her own mother has trouble understanding her at times.
Translating finished streams is possible but likely not cost effective given that even a short stream is at least an hour and usually more like 2-4+ hours so you're looking at 10-20+ hours PER WEEK, PER STREAMER.
By comparison the "cheap crunchyroll translators" are working with 22 min episodes so even an entire 20 episode season is barely more than 7 hours of material to work through.
What maybe could be done is have a team of editors that create official highlight reels which can then be translated.