Ask the consultant to perform (or at least implement) LTV measurement across 3&#x2F;6-months stage. Price sensitive bank-account-checking users will act as a canary, and at least in the Boston Globe case, I suspect tactics like these to increase churn by at least as much as they increase conversion (implying the business will only see benefit for the next N month after consultant).<p>As for trust, the US case is simple: report it to BBB.