You may not like a wallet advertising a particular service and I understand this. But, that doesn't mean the wallet is not secure.
Mycelium wallet is open-source and also gives you full control over your fund. There's nothing in the code they hide from users.
Secured wallets or not what they are doing is below expectation, do you have any idea how many holders/customers they must have led to 1xbit thru their Media? When a reputable source advertise a certain product the market and the amount of users becomes high, what do you think would happen if Elon Musk was to advertise 1xbit or tweet about them? Millions of people would get scammed.
I understand the need for money, but this is way below the belt for Mycelium. Of all businesses and services, they had to go for a proven scam such as 1xbit?
I've lost my respect for Mycelium, they chose money over a good reputation who know what they would do next. The fact that they have a promotional code drives me insane.