It depends on the CLA. In some countries, you cannot not have a CLA because there's always an implied contract.
Many CLAs are just a hassle (basically, DCO that has to be reviewed by the legal department). But a lot are asymmetrical in a substantial way and the original developer gets to play by different rules than the rest. CLAs in the second category tend to be problematic.
Even that is not a completely clear indicator because in some cases, the asymmetry is only intended to help with potential future relicensing in alignment with the project's goals, and not to enable commercialization (either today or at some point in the future). Some organizations have resisted direct commercialization of the code they have been entrusted with for decades, so that can happen even with an asymmetrical CLA.
Many CLAs are just a hassle (basically, DCO that has to be reviewed by the legal department). But a lot are asymmetrical in a substantial way and the original developer gets to play by different rules than the rest. CLAs in the second category tend to be problematic.
Even that is not a completely clear indicator because in some cases, the asymmetry is only intended to help with potential future relicensing in alignment with the project's goals, and not to enable commercialization (either today or at some point in the future). Some organizations have resisted direct commercialization of the code they have been entrusted with for decades, so that can happen even with an asymmetrical CLA.