I spent part of today choreographing the first part of a massive 30,000,000 LOC SVN to Git migration for my employer with ESR's (phenomenal!) `reposurgeon`. Never underestimate the long tail of database usage, even code data. (Any port in a storm, of course, I'll take Subversion than no VC at all any day of the week.)
Learning this aggressively and increasingly niche skillset is why I wrote https://andrew-quinn.me/reposurgeon/ earlier this week. I had trouble even finding SVN repos in the wild to practice conversion on.