Instead of leeching, ask the file sharer to re-upload to a free-friendly host like Gofile, Pixeldrain, or MediaFire. Many will oblige if you ask politely in forums.
Let's address the two big questions.
Legality: It is a gray area. Leeching violates Jumploads' Terms of Service. If Jumploads detects leech activity, they may ban the leech server's IP or delete the original file. However, end-users are rarely pursued. You are bypassing their business model, so consider it an ethically gray but common practice among downloaders.
Safety: This is critical.
The "new" leeches are riskier because they haven't built a reputation. Stick to debrid services if safety is your #1 priority.
Web-based leech generators have a short half-life. The "new" ones that are confirmed working this month include:
Debrid services are legal (they only download what you request). For $3/month, Real-Debrid acts as a permanent "new leech" for Jumploads and 70+ other hosts.
If you rely on Jumploads for large files, "leeching" can become frustrating due to broken links and slow speeds on free generator tiers.