In terms of using them in general, what use are they to you?
Since they are almost always a cheap option, I mainly scoop them up to set up sites on. I will work through themes and customization and then transfer the site over to my actual address saving down time and hassle.
.xyz is just such a radical name in terms of track record, response and usage. On one hand you have companies like Google picking it for Alphabet (although it was likely due to reason of just having a memorable and clever domain abc.xyz), on the other hand companies like Namecheap kicking the domain out of its registry.
The domain is so cheap that it attracts an army of spammers, which causes lots of headache to all kinds of service providers, as well as owners of legitimate website owners running on .xyz domain.
Yet there are also still many domain investors and brokers holding on to premium .xyz names that do not come cheap.
The risks of running with the .xyz domain are obvious - search engines might penalize them in their listings, your registrar might change their position on servicing it, etc. But I am hopeful that the big search engine companies have the tools and smarts to be able to dissect between a scam and a legitimate site, so not to penalize everyone who invested time and money into a quality resource.
I agree with the spammers part, we put in filters to just block all .xyz's from ouro email servers due to the rapid amount of spam from them.
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I don't think there is anything wrong with .xyz extension but I agree with the spammer part.
There is actually enough that is wrong with .xyz. In addition to all the spam problems, it has been plagued by bad PR and decision-making by owners. None of the top domainers in the industry would touch it.