DMCA abuse in gambling is brutal right now. Competitors are filing bogus copyright claims knowing Google auto-removes first and asks questions later. You need to counter-notice immediately on every false claim through Google's DMCA dashboard, but expect 10-14 days minimum for reinstatement.
Start documenting everything - screenshot the original claims, save your content creation dates, keep proof you own the content. Most gambling DMCA attacks target generic content like game descriptions or betting guides that multiple sites use similar versions of.
Consider moving critical content to subdomains or CDNs that are harder to target, and watermark your original images/content. Some sites are also success with preemptive copyright registration of their key content to make counter-notices stronger.
The nuclear option is filing false DMCA complaints back at whoever's attacking you, but that gets messy fast.