Agreed, people immediately think of junk foods like Doritos or soda when they hear “ultra-processed” but are surprised to hear by most definitions, yogurt and multi-grain bread for breakfast is “ultra-processed” as well despite those things being world’s apart in terms of health impact

Encrypted Matrix or mattermost server with jitsi?

Depends how close they are. Most of my friends (that are into self-hosting and collecting Linux ISOs) are across the country / world. So mailing encrypted SSDs works best for large transfers and nextcloud for small transfers