Isn't setting up barriers to entry generally considered to be a part of healthy competition? No, it is not. This is better described as vendor lock-in, than

Isn't setting up barriers to entry generally considered to be a part of healthy competition? No, it is not. This is better described as vendor lock-in, than a barrier to entry. But vendor lock-in is also against healthy competition. Healthy competition means that users choose your product because it suits their needs the best, not because they are somehow forced to choose your product.