Each year the internet connections get faster and faster for the public, so eventually everybody would be able to play, but for now there are still a lot of people that have a connection fast enough for the project, so i don't think its a major problem, but a minor one, which will be solved in time.
Indeed! Even some mobile networks are faster then some internet connections at home 5 years ago

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Things are evolving really fast! I really dig this project! So much potential and so much great features
