Can a service really be “bought” buy a consumer? It can be paid for, sure, but bought? Only another company can buy it and own it since it’s a service.
However, if they sell you the server software to host it and they leave out some essentials like an authentication server that they own, then yeah, there’s a point there. But in this world of subscription-only, you’re only buying access that can be revoked at any time.
It still means something, just not what we want to mean. If you want to own stuff, don’t buy access. Or better yet, use opensource and donate what you would’ve paid to the developers/maintainers. They probably will do a better job a trying to keep it runnable and for longer than most corps.