I think the answer is "it depends".  As Mike Voorhis says, his home
stuff just works.  And I certainly allow incoming SSH and other
traffic to my home network.   I honestly haven't tested if they block
outgoing SMTP (port 25 traffic) recently, but checking now, they don't
seem to be blocking it since I could get to my VPS on port 25 from
home no problem.

I *have* been slowly working to get Wireguard setup at home so I can
tunnel over a VPN to my VPS to make some things simpler, so I just
have one end-point on my OPNsense Firewall at home which allows
connections from remote devices into my network.  This way I don't
need quite as many firewall rules on OPNSense.  At least that's the
idea, but lack of time and bugs have slowed my progress here.

> I could swear I read before, at least for residential services that
> Charter (now Spectrum) internet did NOT allow you to host a site
> which is why I have never tried to do it.  I would guess that its
> all about the bandwidth dollars.  Below is a link to their current
> TOS (terms of service) in case it is of interest:

I think if you start hosting something that gets their attention,
they'll shut you down.  *shrug* not really sure.