CDNs can track which sites you are browsing, at the very least via knowing the request referrer URL. The larger the CDN, the more you are likely to be served a file from it, and the more information it can collect about you.
What selfhoster11 said is the principal reason. In practice, you take for granted that CDNs are generally more available because they’re bigger, but it also means they’re more likely to be blocked. As an example, sites that use CDNs don’t load well in China. Sites that don’t use CDNs generally work flawlessly.
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Curious, why are you opposed to CDNs? I don't even know that I would disagree, I'm just curious why.
CDNs can track which sites you are browsing, at the very least via knowing the request referrer URL. The larger the CDN, the more you are likely to be served a file from it, and the more information it can collect about you.
What selfhoster11 said is the principal reason. In practice, you take for granted that CDNs are generally more available because they’re bigger, but it also means they’re more likely to be blocked. As an example, sites that use CDNs don’t load well in China. Sites that don’t use CDNs generally work flawlessly.