You can just register a GSuite Business account, with unlimited storage. They have a fine print that says you need at least 5 users in your account or somethin

You can just register a GSuite Business account, with unlimited storage. They have a fine print that says you need at least 5 users in your account or something, otherwise they limit you to 1 TB. However they are not enforcing that limit and on /r/DataHoarder/ you can see people with dozens of TB stored without issues. And even if they start enforcing it, if you pay for multiple accounts it would still be pretty cheap and you don't get this multi-account management overhead.