Most companies will not "delete" your account. They will deactivate your account. It is hard to delete things in SQL databases that use FKs, and in many cases it is illegal or inadvisable to delete all customer data (e.g. if you need to keep invoices for accounting reasons, or if you are eligible for chargebacks). Small startups are often busy trying to keep everything working and go after their key metrics and don't have time to build a system robust enough to handle deletions.