At least I understand this to mean that customers are not necessarily offered better maximum speeds. The satellite’s increased data transfer capacity allows for more terminal devices at once, meaning new potential customers. Without the bandwidth getting clogged, speeds fluctuating, and latencies increasing.
Kind of like 5G. Great on paper and in optimal conditions, and towards the evening speeds drop when neighbors start streaming Netflix. Or at mass events, you’re lucky to open a webpage on your phone when everyone is posting to social media.