They are arresting people. They need to investigate if those people are immigrant, then investigate if they are there under an irregular status, then they have to investigate in order to find out if any crime has been commited.
People is not illegal. Those arrests/detentions seem to be the illegal part.
On my synology nas I have installed navidrome to serve the music, and consume it via web, and a few android and linux apps like ultrasonic or supersonic
Depending on your level of paranioia. First, you don't expose your containers, but their port(s).
With a reverse proxy, you will likely expose only 1 port, 443, no matter how many apps/containers/ports it will be pointing internally. For this, having a proper dns setup will be key, and a service like cloudflare dns (not tunnel), which additionally you can proxy your proxy. Also, you will need certificates (letsencrypt) for your traffic to be encrypted. Here, everybody will potentially have access to your services.
Another option is a zero trust tunnel, but as you had seen streaming may break tos. It will be likely enforced if you stream a lot, but I seriously doubt you'll get any problem by having sporadic one or two users.
Tailscale, you need to add all the devices you need to access your services into the mesh, and you'll need to re-authenticate every one again every few months.
Setting up a VPN (selfhosted) will require your devices to sign into it when accessing your services, and it seems to me the best approach as this way you will nave the most control over your setting.
Don't forget to mention that, for this to work, your ISP should provide you with public IP, because if on CGNAT you will have to go with something like tunnels or tailscale.
I have some thermo regulated valves that require 1.5v as well, so for those I decided to go with regular alcaline batteries. Those are still above 80% charge after 1 year of usage, that is why I decided not going with rechargeables for those trvs
Stay classy 'murica!