Is it worth subscribing?
Depends what you do, and how often, really ...
If you visit streaming sites, download movies/music/books etc etc from sites where you don't pay .. then as you are probably in breach of copyright rules a VPN will prevent you getting "cease and desist" letters from copyright holders via your ISP.
If you do none of those things, and only visit "sensible and legal" sites then you have nothing to hide, and it is probably not worthwhile
If your only concern is some rogue site identifying you from your IP address then a VPN will hide that to "most" seekers.
Be aware that some, not all, will use an overseas IP as your "false" one ... this can cause problems when trying to use some UK based sites like your bank (which will think you are abroad) and the BBC, (which will stop you watching UK based video streams) as two simple examples.
VPNs are cheap enough now, around £5.00 a month for a decent one , if you are concerned at being identified then just try one, if you don't like the results, bin it ..