Regarding
123 movies, I have been using this site for several years now. And although, as you said, it is indeed a free alternative to paid services, it is important to understand that sites like this always have more risks. For example, the site often has pop-up windows with ads, which are sometimes persistent, and this is really annoying. And the ads are not only banners, but also in the form of videos that start automatically, which can be very unpleasant. I always try to use ad blockers to avoid this. Now about security. Although 123movies itself is not a virus carrier, there is a chance to stumble upon phishing pages or a link that will lead to a malicious site. For example, sometimes on the movie pages there is a link to "download" or "install a plugin", which in reality can be a virus. Therefore, if you decide to use the site, you should always be careful and not click on suspicious links. It is better to use a VPN to hide your data and make your stay on the site more secure.