If you mean, can one of those extensions be spammed & otherwise not worth it to use as a backlink? Absolutely. That can happen with nearly any backlink source.
Toxic backlinks come from low-quality or spammy websites, link farms, or sites involved in black hat techniques. Any link that comes from these kinds of domains will be toxic.
Backlinks are inherently beneficial, you have to asses the each likh and find its pro's considering the quality, relevance, trust factors & natural linking.
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