Mostly centralization and monopoly concerns, considering that 80% of websites use Cloudflare. The data security isn’t great (Cloudflare can obviously access all traffic unencrypted) but the tunnels are free. I won’t yell at people for using Cloudflare, especially for the DDOS protection which is difficult for a smaller company to provide, but it’s always treated like everyone has to use it or else their website will explode, which gets annoying.

Also checking in

Noone said it’s gonna be easy. Besides, if you don’t understand that stuff you really shouldn’t be running your server anyways

I have all of my domains under my name with WHOIS privacy enabled and I’ve never gotten a spam call or email from my domains. Your registrar won’t give out your personal information unless they have to comply, like a legal warrant. But if you’re worried about your particulars getting leaked somehow, you can use a VOIP number and PO Box address as your contact information, as long as you use your real name so your domains can’t be taken from you during a dispute. Registrars like Njalla and Epik also give you the option to list them as the domain contact so you don’t have to leave your personal information at all, and they’ll forward any messages to your account.