The M365 Business Premium and 500 total user limit on the one hard are quite arbitrary, and on the other clearly focus Microsoft 365 Lighthouse on a product (M365 Business Premium) and a market segment (under 500 total users). It's a shame to conflate Microsoft 365 Lighthouse--which is narrowly focused--with Azure Lighthouse which operates without scale limitations across dozens of Azure products and services. I'd suggest a new name for this without such a broad scope as 'Microsoft 365 Lighthouse', like M365 Business Premium Security Portal for CSPs. As a data point from an Gold Partner MSP/MSSP, I can share that 25% of our managed CSP customers show up as Active (eligible for Microsoft 365 Lighthouse). The other 75% are too large or don't own any M365 Business Premium. That makes 'Microsoft 365 Lighthouse' a non-starter for our operations, but perhaps for small MSPs with small customers that all buy M365 Business Premium, there is a fit.