ayi.comは安全ですか？

Very likely a scam. Possibly also involved in spamming, saw a post on another website (one with a large underage userbase, even) telling others there was a "really cool trick" if you sign up as a male between 35-50, along with a forged testimony written under the username of someone who had no knowledge of the site. Of course, multiple people fell for the post and were confused as no "cool trick" actually happened upon creating an account. I suspect it was a way to illegitimately get more users. Multiple people who signed up with actual interest in using the site complained about it being suspicious as it seemed the messages they received on their account were fake and not actually from other users. One person said once you sign up for the $30/month fee, the only way to cancel your subscription is through fax, no doubt deliberately chosen by the website owners as to make it more of a hassle to cancel any payments. I suggest staying away.

It's a trap!! A total rip-off. Unlike similar services which ask for a little bit of money here and there to unlock special features, these assholes extort $30 a month from you, just so you can read messages in your in-box, that may or may not be from people actually interested in you.