Statistics, SEO and email campaign system

public function evaluate(User $user, string $channel, ?CarbonInterface $now = null): PolicyDecision
{
    $now = ($now ?? Carbon::now())->copy();
    $reasons = []; // collect ALL reasons, not just the first, so a preview can explain every skip

    if (! (bool) $this->cfg('enabled', false)) {
        $reasons[] = 'kill_switch_off';
    }

    if ($user->is_banned || $user->deleted_at) {
        $reasons[] = 'account_blocked';
    }

    if ($channel === self::CHANNEL_EMAIL) {
        if (! (bool) $user->is_subscribed) {
            $reasons[] = 'no_marketing_consent';
        }
        if ($this->emailSuppressed(trim((string) $user->email))) {
            $reasons[] = 'email_suppressed';
        }
    } elseif ($channel === self::CHANNEL_PUSH) {
        if ($this->isQuietHour($now)) {
            $reasons[] = 'quiet_hours';
        }
    }

    // ... weekly cap from the shared marketing ledger, then the holdout control group
}