I’m not sure if you realise but Hubspot has many, many plan variations. e.g. Service Hub (starter, prof, enterprise), Marketing Hub, and Growth Suite (all of them, from $153 a month)
You have probably paid annually and so got a discount for that, so therefore expect to pay for the whole year. As every Hub owner has a differing number of subscribers, and an account is billed to its owner with their own address and card and website, I doubt very much whether anyone could take over your account.
HubSpot claims to be the “all in one” solution because they have content marketing and SEO integrated as part of their systems. If you’re looking for a solid CRM with marketing automation then I recommend Active Campaign, it’s basically just as powerful for a fraction of the price and without all the additional bloat that hubspot provides. I think they quoted me 15k for the year or something and it would be the same if i referred any of my clients to them. Crazy.