reCaptcha itself is a Google service, and I suspect that some people would be opposed to that just for that reason. There are also potential issues with GDPR that would need to be addressed. There are alternatives, often based on “proof of work” rather than “proof that you are a human”, but I’m not convinced that that approach would help here. If you know of an option that (a) could be made GDPR compliant (e.g. by self-hosting), (b) would actually work to force actual humans to fill in an actual form and (c) isn’t ethically problematic for some other reason, I’m sure that people would be interested.
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