What do these questions have in common?
Is the format tag at all useful to anyone?
I assume the format tag means any sort of formatting in general.
But as you've pointed out, the format tag is quite pointless and generic.
I can't see it being of any use to anyone, as no one specialises in general formatting.
format is too broad to be helpful.
Some of those questions is probably using two tags instead of one. For example, Talend Open-Studio Supported I/O Formats could use file-format, Convert text to image file Android could use file-format (instead of file and format), and change format of date with PHP could use date-format (instead of date and format).
If the tag needs to be removed, the questions that could use a different tag should be first manually retagged; then the tag could be burnitated.