fullreleases.bizは安全ですか？

A complete scam--if you are looking for something rare or hard to find, this site will invent search results to match what you type in (try searching on your own name) to entice you to sign up. The search engine may have links to valid bittorrent downloads, but it is likely that these can be found from other free search engines. The sign up page only mentions the price of $4.95 for "today only"-- it doesn't mention the automatic $29 per month charge that they will start billing after you sign up. Also, they may continue to bill the monthly charge after you have canceled your account. The only way out may be to dispute the charges with your credit card company and/or get a new account # to end the charges.