> They are not collecting and using your personal data.
Do you see how GDPR doesn't apply, then? ...you're contradicting yourself.
I'd still question the legality of the data collection by altering the offered service without properly informing the affected users. Whether GDPR applies doesn't matter, and whether it's a free tier service doesn't matter either. You're a consumer of Cloudflare, so any consumer rights apply.
As a website owner, you are responsible towards your users for data collection (your architectural choices, your responsibility). This was my concern on GDPR.
Sibling comment says data collection is disabled in EU.
I never said "they would violate GDPR". I was questioning if it could be the case. Someone said it's not the case as the feature is turned off in EU. Reading their blog, it also looks like they don't collect much identifiable data.
When selecting free tier of such commercial MITM, opt-in RUM data collection is really far from the top ethical concern. I'm not saying it's a good thing and I'm not deploying their solutions to my websites.
IANAL but it looks like they saw a risk and decided to not put you, as a website owner using their free tier, at risk of breaching GDPR for RUM. That was my concern and it's addressed.
GDPR is about legality and covers the LinkedIn case you mention.