If any of what you were saying were true, then this wouldn't be just a discussion about banking software all the time, and we would see it happen with all kinds of other software, scaling with the complexity of the application or the level of provided customer support or the intended sophistication of the user or how "enterprise" the target market sounds... but none of this is the case, and if you tried to cluster products that do this along some axes the ones that stick out like a sore thumb are all of the form "controls something sensitive": money (banking, payments, investing, etc.), health data, copyrighted media (streaming), and multiplayer gaming (due to cheating issues). All of these people are very open about why they think they do it, and while we know they are incompetent, they are not doing it to be malicious and they have no incentive to lie to you about this: if a bank were truly not supporting your device because it was rare, they'd just say it, and we have ample evidence of this from banks choosing to not support "niche" browsers (including an era of "anything other than IE6" omg ;P). So: "cool story bro", but it is clearly wrong, lol.