Unofficial uploads. Toei is aggressive about takedowns, so links can disappear. For legal streaming, try TokuSHOUTsu (via Tubi/Pluto TV) or buy official Blu-rays.
On the Internet Archive, you can typically find Kamen Rider Gaim episodes (raw or with fansubs), movies like Gaim Gaiden or Sengoku Movie Battle , and occasionally music or scans. These are user-uploaded, not official releases. kamen rider gaim internet archive
Varies widely — some uploads are decent 480p/720p, others lower. Fansubs (e.g., Aesir, Over-Time) are often the versions archived. Unofficial uploads