I used to self host some stuff on an old 2011 iMac. Worked fine, actually

I name mine after different places or ships from anime shows I watch. My laptop is Bebop from Cowboy Bebop, my desktop is goingmerry from One Piece, my Kali VM is senku1 from Dr. Stone, and my NAS server is amaterasu from Fire Force.

My understanding is that it’s just not as secure. Any open port can be considered a potential way for a hacker to get in. Of course, that doesn’t mean it will 100% happen and you will get hacked, but at least in the case of Tailscale, it does it in a secure way that makes it so you don’t have those open ports. Basically, it’s not bad to just expose them to the internet, it’s just not as secure as using tools like Tailscale.