A number of companies lose money on customers when using a freemium business model (e.g. on Spotify ~20% or so are paying customers). People got Monzo initially for the overseas card benefits but will then transfer to a full PCA account as they it starts offering full banking services that are infinitely better than traditional banks (for digital users). I trust Monzo!
Check out the financials for Freetrade when they’re released, that should give you more comfort, they won’t be waiting long before turning a profit! 
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