Definitely a good idea for mobile, though if on desktop, I’d suggest bypassing the website altogether and using a torrent aggregator such as Jackett, which can be integrated into qBittorrent via an extension.

In the case of 1337x.to, the megathread lists 1377x.to as the fake replica of it. In terms of quality, 1337x.to is one of the best public torrent indexers.

While I personally prefer not to use YTS releases due to their low quality, and can’t seem to find a legitimate YTS link that yts.mx would be the replica of, as long as you’re downloading via Prowlarr rather than going to the website itself, the only risk is the trustworthiness of the releases, rather than the possibility of ads or otherwise unwanted links on the website itself.