I was looking at simple 2 bay home NAS and Synology was - quite logically - one of the contenders. Now I’m glad I ordered differently. Went with Asustor AS5402, which might be not as polished package as a Synology option, but they’re very open about it and say it’s just regular PC so you can instal e.g. TrueNAS if you want. This openness convinced me.

I can’t think of how p2p messengers even could have webapp.