Why a new business is a risk to an acquirer
When an acquirer settles card payments to you, it remains liable if customers later dispute those payments and you cannot pay the money back. With an established merchant, the acquirer can look at months of statements to estimate how often that happens. With a new business, there is no record, so the acquirer has to estimate risk from the business model, the owners and the website alone.
That uncertainty is why startups meet requests for more documents, reserves or low initial monthly limits. It is also why aggregators are happy to onboard new businesses quickly and then freeze them just as quickly: their model is to accept first and monitor aggressively. Knowing this helps you choose the right route and avoid surprises when volume starts to grow.