Our farm has around 4000 LTE modems. Most individual providers do not operate such "big" numbers, which is why they normally do not keep "clean" connections. For example, many US mobile IP providers use wifi and not really LTE, so they end up in a different IP pool. Might show as mobile in IP databases, but I think Instagram is well aware of who is using those since almost no real legit users are on those (which is the whole point of mobile IPs, to begin with). But in general, yeah, totally agree with you.
From experience operating shared and dedicated mobile IP farms for years, the common fingerprint is always you, not the technical side of things. Yeah, there are thousands of people sharing your fingerprint, but none of them have the same fingerprint and have an iPhone giveaway if you get what I mean.
The mobile IPs market is a tricky one, especially for beginners. Since there are so many resellers, it is hard to judge if the price point reflects a good quality product, or just resellers wanting a higher margin. And the quality differences between WIFI mobile IP ranges and LTE mobile IP ranges are huge. But WIFI IP ranges are easier to acquire (business connections) and more scaleable (without investing a lot of money). If you compare it to our LTE farms, we invested almost 150k$ just in modems (not counting cables, computers, UPS, etc.). It can get crazy really quick.
The recent batch that left the office and went to one of our apartments:
View attachment 209628
It is a quite expensive bag