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@openstreetmap and they do appear to be hosting their own tiles. Or rather... OSM Entities. For instance:
deutschepost.de/int-postfinder

For me pbf was something new, btw :}

EDIT: clarified by @amapanda that it's not exactly the type

Write-up on the format:
wiki.openstreetmap.org/wiki/PB

@KasTasMykolas OSM data is often distributed in OSM PBF format. But I think DP/DHL is using vector tiles. The file name ends in .pbf too, and the OSM PBF uses protobuf format for some of it too. But the file format internally is very different, and optimized for differnet things.

@amapanda thanks a lot for clarification! This must be the reason osmium is failing on me with this:

$ ./osmium fileinfo -e /tmp/2782.pbf
File:
Name: /tmp/2782.pbf
Format: PBF
Compression: none
Size: 26024
PBF error: invalid BlobHeader size (> max_blob_header_size)