It depends on what service - some, like Jellyfin, are accessed only from home IPs which are static (for music through Jellyfin I use offline mode to prevent too much mobile traffic), so I can add those specific IPs in the whitelist. Otger services I need to access from elsewhere, and I can add entire subnets (i.e. for my phone carrier network or VPN servers). Those change once in a while and that is annoying. Other services I want publically available.

Jellyfin especially still has some unsecured endpoints where it would be wise to take some.extra precautions. I think the risk some people seem to think this poses is a little overblown (i.e. rights holders finding your instance and reverse mapping your entire library and suing you to oblivion), but better not risk it.