Google has been steadily migrating the entire web to MFI over a span of six years. On May 22nd, Mueller made a remark indicating that they’ve finally wrapped up migrating the last set of websites.
That being said, there are still a few outliers. To paraphrase Mueller, there remains a small percentage of websites that aren’t suitable for MFI, and as a result, these will continue to be indexed based on their desktop version.
