Safe services for Mythic+ boosts - are there any?
Are there any safe services for Mythic+ boosts that don't require account transfer? I've heard that many sites offer Mythic+ key passing services, but I have concerns about security. Account transfer is always a risk of banning or compromising personal information.

Yes, selfplay is the safest way to boost, because you don't give your account to anyone, you just play in a team with experienced players. I was skeptical before, but eventually, I tried several services and I can say that the main thing is to choose a proven platform. For example, one of the reliable options is a link. They just have a self-play option, where you just log into the game and go into the dungeon with a professional group. This eliminates the risks associated with account transfer, and you get a guaranteed result - a locked key and loot from the Great Vault. I used this service a couple of times when I didn't have time to look for a party, and everything went smoothly. The main advantage is a well-coordinated team, that clearly knows the tactics and mechanics, so even difficult keys go quickly and without unnecessary stress. So if you want to get a quality boost without risks, selfplay is what you need.

Selfplay is really handy if you want to control the process yourself, but not waste time looking for a team. I personally have never used boosting, but I heard that if you take such services, then only on trusted sites, because there are enough scammers in this area. In any case, if it is possible to find a good team on your own, I would try this option first - it is not only safer, but also more interesting in terms of gaming experience.