yeah…
They asked for easy, or newbie friendly - and didn't particularly mention privacy concerns.
Other than that, if they don't have a port 80/433 ingress from their ISP there are scarce simple solutions that don't require another server that also needs management, either by them or a corporate entity.
back when i was on a DOCSIS modem, i noticed concurrent downloads would disrupt uploads and vice versa. i think this may depend on the type of connection OP has.
I used to work at a cable company, that was either a problem that people with low SNR had. Either from external factors (tree branch on a cable line) or in-home ones (bad splitter). A modem will ramp up it's gain in order to offset this (to a point), and in so doing, create a lot more interference between channels. OR they were hitting their ingress rate limit (which is quite agressive on residential plans because DDOS'es). It's surprisingly easy to hit your ingress rate limit for modern http/https webservers hosting complex web apps. Lots of concurrent connections open up to try to download all the resources when you go to any website in a modern browser and while it's not a TON of data, the short period of time causes the traffic to easily hit the PPS/BPS rate limit that ISPs employ.
But yeah, it all depends on the ISP.
I have personal experience with these "churches" after my time in Portland. They were far and away worse than the homeless. They will harass and abuse you on the street ESPECIALLY if you dare express cynicism towards their spiel.
They will follow you, and verbally abuse you unless you bee-line straight for a police station too.
Why these charlatans are able to masquerade as a religion I'll never know....