I do not really care , however, this may affect the confidence that some users will have in LimeSurvey and the limesurvey.org service.

The minimal part is to show the checkbox, here it was hidden by default !
And you must have the information on the 1st email !

Some more information
https://checklists.opquast.com/en/web-quality-assurance/the-newsletters-frequency-can-be-found-before-subscribing
https://checklists.opquast.com/en/web-quality-assurance/subscribing-to-newsletters-is-subject-to-a-confirmation-process

Or here : https://www.mailerlite.com/blog/optimize-email-signup-form

Make your value proposition clear
Optimize your call-to-action / be clear

Or https://mailchimp.com/resources/newsletter-sign-up-examples/
Be clear about your intentions
Have a double opt-in process

I don't check GDPR here, unsure hide newsletter checkboix was GDPR compliant.

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