AGPL is exactly the spirit of open source. The license used by bear violates freedom 0. AGPL ensures that freedom 1, 2 and 3 are allowed even in hosted services scenarios.
Freedom 0 the freedom to use the work
Freedom 1 the freedom to study the work
Freedom 2 the freedom to copy and share the work with others
Freedom 3 the freedom to modify the work, and the freedom to distribute modified and therefore derivative works