As Intel found out when they were unable to stop AMD naming their Intel 486 compatible CPU Am486, there's a certain threshold of creativity a name has to reach

As Intel found out when they were unable to stop AMD naming their Intel 486 compatible CPU Am486, there's a certain threshold of creativity a name has to reach for trademark protection. These short letter/number sequences aren't it. Smaller companies than Cloudflare have used similar naming for S3 compatible services without issue, see Backblaze B2