It's sometimes not just about money. Any organisation that alows individuals and teams to freely pick and choose tools will end up with a huge pile of semi-forgotten systems and organisational knowledge spread over multiple wikis, sharepoint sites, trello boards, monday projects and word docs on shared drives and dropboxes. Seen it happen multiple times. Corparate use of "personal/hobbyist" free tiers of popular tools is not just a legal liability, it's also a security nightmare apart from the already mentioned infromation spread problems.