I think it's commendable for a huge corporation building lots of data centers to (partially) offset that impact. Amazon, Oracle and others aren't. It's unhealthy for a single company to be most of the market.
Can you point to a factual source for claiming it's a scam? If India and China aren't signatory to climate treaties, should there be no collective action?
If this were a feasible route, everyone would be pouring billions into the venture and they'd have more than one customer.
Carbon credits are and have always been pure grift and nothing more.