I think a lot of people (be they men or women) might feel more comfortable with being vulnerable and less afraid of being judged, or their secrets and thoughts being exposed or somehow used against them, with AIs than with real people, whether those real people are accessible/attainable for them or not. Perhaps, knowing deep down that it's not real and doesn't have a motive is a feature.

Whether they should be more comfortable (given the privacy problems with these services) is a different matter.

Sufficiently compromised privacy in conjunction with sufficiently sophisticated data markets starts to look a lot like "having a motive", eventually...

How long before your AI girlfriend is sussing out your feelings and desires in the interest of figuring out how you can most effectively be advertised to?