Safe
"is animeflix safe", "does animeflix have viruses", "is animeflix virus free" and "is animeflix app safe" are searched wherever the name is known. The site installs nothing beyond the home-screen shortcut, creates no account and offers no file; three things are kept, your list, your viewing country and your episode marks, all in your own browser and listed on the privacy page. No page asks for a card and no player asks for a plug-in; a page that does is not this site.
Legal
"is animeflix legal" and "is animeflix illegal" have one answer: the anime plays on the service you pick from the Watch now list, and every service on that list holds a licence for the country you selected. Choose the country you are in and change it on purpose when you travel.
Ages
The age guidance is on the service you open, and it matters on the dark and psychological shelf. Adult productions are not listed.