NFT.storage and web3.storage still use IPFS cluster (currently only for pinning requests as added content goes directly to S3/R2). (Funny that you ask, because precisely today NFT.storage stopped uploading to IPFS and fully relies on S3/R2).
There’s still content that is only stored and provided from IPFS clusters and it will be so for a while (iirc).
In any case both platforms are moving to a fully cloud-native architecture and phasing out the IPFS clusters. IPFS cluster helped them get there, and they helped IPFS cluster be where it is (we recently crossed 100M pins in one), so it’s been a win-win.