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Alphabet spins off Starlink competitor Taara
(www.theverge.com)
This is a most excellent place for technology news and articles.
I don't know about the ozone layer specifically, but reentry turns the satellite into danger dust -- mostly metal oxides and burnt polymers. Ozone, being a very strong oxidizer, is the most likely to react with the hot debris, so it probably does damage the ozone layer, but I can't quantify the damage, or the released pollutants.