I found a legal problem, esp. for people with clients in the EU.
Therefore the server at code.jquery.com has access to the IP adresses of website visitors, which is personal data.
According to the EU-GDPR law website owners must tell visitors exactly who has access to their personal data and ensure their data does not get into more hands.
Sadly code.jquery.com does not have a privacy statement on their site nor are they listed on the privacy shield website https://www.privacyshield.gov/list
And webflow does not list jquery.com as a subprocessor on https://webflow.com/legal/subprocessors
Here is an article from a Swiss lawyer on exactly this topic:
They suggest simply using a different jquery hosting like Google Hosted Libraries, because they have a privacy statement and are listed on the privacy shield website.
Or even better: Upload jquery to uploads-ssl.webflow.com and include it from there.