Weird vac ban

Somewhere early 2025 I used to have a second main I had 100€ worth of skins there and shit I never cheated on MM and I even had -insecure bc sometimes I used that account to HVH and I injected plague a couple times and like after. A while I got a vac ban not a timeout not a game ban a VAC BAN and before my main main also got a vac ban could it be ip or hwid fault bc im keep buying new accounts and grinding and after around 100h my acc gets banned