"Open source is closing its doors. Yesterday, tldraw took the unusual step of removing the tests from their codebase, on the theory their continued presence would make it far too easy for anyone with an agent to build a cleanroom rewrite and undermine their business. Nothing says "closed for contributions" quite like not even having access to a test suite or CI to work with"

This could always happen with open source. If you are worried about 'undermining your business', you shouldn't release any open source, as big companies can always do this.