The unintuitive "hold the menu while you turn it on" routine probably is one of the ways they got the radio Part 90 certified. Having a LEGAL Part 90 radio should mean a lot of sales for them, and Part 90 apparently requires a radio to be locked down (in channel mode) with no simply obvious means of bypassing that. So, odd button combination, no indication that it exists on the radio, and that opens up a whole new market for them.
I still fully expect the FCC to take heavy action against most of the BaoFeng (among other brands) resellers in the US, because there are so many folks advertising this for ham, frs, or gmrs service, and that advertising itself is illegal. A vendor can't advertise a radio as suitable for ham use unless it is FCC certified. A ham can use anything--but the vendor can't advertise it as a ham radio. Similarly it can't be used with FRS because it is too powerful and has a removable antenna, and it isn't certified for sale for gmrs either.
Unca Charlie has been very generous to turn a blind eye to these.