It's very healthy to be skeptical but there's nothing weird specifically about this.

It gets weird when people stop looking at the books and ignore the circularity.

It also increase risk by reducing resiliency.

It's also 'cleaner' then the Nvidia style deals with OAI who are customers.

'Google Finance' is investing in a company.

Just so happens that company leases something to Google. Not so bad.

Nvidia invests in OAI so that money comes right back as sales <- much more conspicuous, looks like 'vendor financing'.