No matter who it is, if you're no longer using a website or app of some kind, it's best to permanently delete/disable your account. Before you do, scrub as much information as you can, such as deleting any credit card info or address/phone that's on file. There's a few reasons for this:

• If your security choices (e.g. passwords/2fa) are not the best, someone may compromise your active account through normal means and impersonate you
• Even if your security choices are very strong, at some point in the future the site might get compromised by more sophisticated attackers because either (a) the attackers get more sophisticated over time, or (b) the company responsible for account security gets lazier over time;
• This is especially true if the site is eventually sold to a scammy company just trying to make a quick buck. And they all eventually get sold.
• No matter who owns the company, at some point in the future your contact info will get used to try to market bullshit to you. If not them, then the data brokers they sell your info to.

Deleting the account blocks all of these problems (unless the company is particularly scummy, but what are you gonna do about it)