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
filterToSend = std::max(filterToSend, ::minRelayTxFee.GetFeePerK());
                if (filterToSend != pto->m_tx_relay->lastSentFeeFilter) {
                    m_connman.PushMessage(pto, msgMaker.Make(NetMsgType::FEEFILTER, filterToSend));
                    pto->m_tx_relay->lastSentFeeFilter = filterToSend;
                }
                pto->m_tx_relay->nextSendTimeFeeFilter = PoissonNextSend(timeNow, AVG_FEEFILTER_BROADCAST_INTERVAL);
            }
            
            
            else if (timeNow + MAX_FEEFILTER_CHANGE_DELAY * 1000000 < pto->m_tx_relay->nextSendTimeFeeFilter &&
                     (currentFilter < 3 * pto->m_tx_relay->lastSentFeeFilter / 4 || currentFilter > 4 * pto->m_tx_relay->lastSentFeeFilter / 3)) {
                pto->m_tx_relay->nextSendTimeFeeFilter = timeNow + GetRandInt(MAX_FEEFILTER_CHANGE_DELAY) * 1000000;
            }
        }
    } 
    return true;
}
class CNetProcessingCleanup
{
public:
    CNetProcessingCleanup() {}
    ~CNetProcessingCleanup() {
        
        mapOrphanTransactions.clear();
        mapOrphanTransactionsByPrev.clear();
        g_orphans_by_wtxid.clear();
    }
};
static CNetProcessingCleanup instance_of_cnetprocessingcleanup;