What are the disadvantages of freemium pricing?

As a curious investor, I'm wondering about the downsides of freemium pricing in the cryptocurrency and finance industry. Could you elaborate on some of the potential disadvantages that businesses might encounter when adopting this pricing model? Are there any specific challenges related to customer retention, revenue growth, or even brand perception that companies should be aware of? I'm particularly interested in understanding how these drawbacks could impact the long-term success of a cryptocurrency or finance-related product or service.