While the world of cryptocurrencies is becoming more and more closed and competitive, Vitalik Buterin is sounding the alarm. The creator of Ethereum now defends the “copyleft”, a license obliging those who reuse open source code to publish their improvements. This turnaround aims to counter the private appropriation of collective knowledge and to preserve the ideal of collaboration that has made the strength of the web3.
In short
- Vitalik Buterin calls for generalizing “copyleft” licenses, which oblige to share the improvements made on open source code.
- The crypto world has become more closed and competitive, slowing down the free sharing of the code.
- Copyleft licenses require reciprocity: which uses open source code must share its developments.
- This strategy aims to create a “vast code reservoir” accessible only to transparent developers.
The philosophical turning point of the creator of Ethereum
In a blog post published on Monday, Vitalik Buterin announces a radical change. He who has always supported so -called “permissive” software licenses, allowing free reuse of the code without obligation, now militates for copyleft, a more demanding license.
The principle is simple: any developer who relies on open source code must share his own modifications.
This change goes beyond the legal framework. It reveals a break in the culture of the web3: the spirit of sharing which animated the beginnings of the crypto fades, replaced by a logic of competition.
The cryptocurrency sector in particular has become more competitive and mercenary, and we are less able to count on people who publish their work in open source by pure kindness.
Vitalik Buterin
Today, projects seek to protect their competitive advantage, even at the cost of isolation. The time of sharing by altruism seems to be over. Faced with this evolution, Vitalik offers a binding framework to preserve open innovation.
The paradox is striking: he who has always expressed his distrust of patents and copyrights, today chooses a more rigid path. A pragmatic response, according to him, to an ecosystem where benevolence is no longer enough to guarantee collective progress.
A defensive strategy in the face of the financialization of the sector
This Virage to copyleft is part of a broader reflection led by Vitalik Buterin on the future of Ethereum.
Already during the ETHCC 2025, he had expressed a strong concern: if Ethereum loses his founding values, he risks becoming an empty shell.
Centralized governance, decentralized applications with closed codes, exposed personal data … So many drifts which he considers as real threats to the initial promise of the web3.
To answer it, Vitalik sees in copyleft licenses an effective defensive weapon.
They make it possible to build a common technological base, but reserved for those which engage in a process of transparency.
Clearly: if you take, you have to give back.
This approach is not unanimous, but it is increasingly aroused support within the community. Crypto investor Adam Cochran, for example, rallies without excessive reserve:
There are certain practical cases where copyleft poses a problem, but overall, I agree with this philosophy.
Even if he recognizes that this method can pose constraints in certain cases, he considers that it remains essential to guarantee a form of equity in an ecosystem increasingly marked by competition and the race for profits.
By adopting this posture, Vitalik Buterin seeks to defend the soul of Ethereum. A project born from an ideal of openness, today threatened by financialization. His choice of copyleft is both strategic and philosophical: he could well weigh heavily in future debates on governance and the future of blockchain innovation.
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