The problem with GA4 is that if you have traffic from Europe, you have to implement a cookie consent popup to comply with the GDPR laws. In theory, you cannot record any data before you get consent, or if consent is declined. It means that your data will be off, because a lot of people decline. It is the most powerful free analytic tool though. And there may be a way to make it work cookieless but I have not found it yet...
Tools like plausible.io are great, but the pricing is proportional to your traffic, so you may have to pay a substantial amount if you have a lot of visitors.
After looking at a lot of those privacy centric analytics, I chose Cloudflare web-analytics.
It is far from being perfect: the analytics they provide is limited and a bit off, but it is totally FREE and cookieless... So no GDPR popup.
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