I don’t really use it for this, but here are some things I do use it for:

• metrics scraping on servers without needing to open ports or worry about ssl encryption. Works great for federating Prometheus instances or scraping exporters
• secure access to machines not directly exposed to the internet. I.e. ssh access to my home box while I’m traveling
• being an exit node for web traffic while traveling. I.e. maybe you are traveling and have a bank who is giving you grief about logging in – masquerade that connection from your home IP

I mostly just use it for metrics scraping though