AFAICT, as of commit a0a422c,  we have 2 different logics to evict outbound peers : lagging-chain (`ConsiderEviction`) and (`CheckForStaleTipAndEvictPeers`). The former to sanitize out lazy/buggy peers who have never sent us a valid header and are always staying behind our tip, the latter triggered in case of stale tip due to block variance to seek a better chain by rotating our outbound peers if we already reach an outbound limit (`EvictExtraOutboundPeers`).

Block-relay-only peers were introduced by #15719. Contrary to outbound full-relay peers who provided us at least a useful header, they're not protected by lagging-chain eviction.

We actually have a comment inside `ProcessHeadersMessage` indicating the contrary behavior. We should either document cleanly that block-relay-only aren't protected or effectively extend the scope of protection to them.

Hinted during #19724 review, see https://github.com/bitcoin/bitcoin/pull/19724#discussion_r475144532
std::vector<CAddress> vAddr;
        if (pfrom.HasPermission(PF_ADDR)) {
            vAddr = m_connman.GetAddresses(MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
        } else {
            vAddr = m_connman.GetAddresses(pfrom, MAX_ADDR_TO_SEND, MAX_PCT_ADDR_TO_SEND);
        }
        FastRandomContext insecure_rand;
        for (const CAddress &addr : vAddr) {
            pfrom.PushAddress(addr, insecure_rand);
        }
        return;
    }
    if (msg_type == NetMsgType::MEMPOOL) {
        if (!(pfrom.GetLocalServices() & NODE_BLOOM) && !pfrom.HasPermission(PF_MEMPOOL))
        {
            if (!pfrom.HasPermission(PF_NOBAN))
            {
                LogPrint(BCLog::NET, "mempool request with bloom filters disabled, disconnect peer=%d\n", pfrom.GetId());
                pfrom.fDisconnect = true;
            }
            return;
        }
        if (m_connman.OutboundTargetReached(false) && !pfrom.HasPermission(PF_MEMPOOL))
        {
            if (!pfrom.HasPermission(PF_NOBAN))
            {
                LogPrint(BCLog::NET, "mempool request with bandwidth limit reached, disconnect peer=%d\n", pfrom.GetId());
                pfrom.fDisconnect = true;
            }
            return;