Personally, I settled with colocation. I pay $60/mo + $2k one-off for the initial hardware + say $150/5y/4TB HDD, which, for 80TB of storage over 5y comes out to a total of ~$88/mo, or $0.001/GBmo. Even if I was to store 3 copies of everything instead of doing erasure coding, my costs are roughly half of what Backblaze B2 charges. And my disks are fully online block storage, not necessarily object storage.
If you can't get together the people for a full cabinet (which I think is definitely worth it, the more you buy at once, the cheaper it gets), there are a number of providers that offer single server colocation. The only one I've really heard much about though is Joe's Datacenter, which is in Kansas City, Missouri.
Unfortunately there isn't really a "Linode" or "DO" in the colocation space anymore. There used to be https://prgmr.com, which offered transparent pricing based on power and bandwidth usage but they've stopped that I believe. The few global providers are generally geared towards multinational corporations or at least businesses more than small groups or hobbyists. You're really best off with the smaller regional providers near wherever you are.
Every major urban hub has a multitude of providers. Some offer expensive, but reliable service, others cheap but you get what you pay for, and there's a mix in between. Talk to people and ask for tours. Every town is completely different in terms of scene.