Business plans usually require a 5 seat minimum, charge per seat, and have different pricing levels - but yeah, nothing stops you from registering an LLC. Namecheap is even running a special: Buy a domain name and get an LLC for free: https://www.namecheap.com/apps/business-starter-kit/

(not affiliated, I was just very surprised when they tried to upsell me last time I renewed my domain :))