If your project is sufficiently popular, that's safe; otherwise maybe not.
As someone else mentioned, when a giant corp absorbs a free project, you can reasonably expect them to maintain it. If you GPL the project, that won't happen. But if it's a popular project, then if it's GPL it will attract more maintenance from people who can't free-ride on the corp's efforts.
(Note that the relevant measure of "popular" is not number of users, but number of people enthusiastic enough to actually contribute.)
As someone else mentioned, when a giant corp absorbs a free project, you can reasonably expect them to maintain it. If you GPL the project, that won't happen. But if it's a popular project, then if it's GPL it will attract more maintenance from people who can't free-ride on the corp's efforts.
(Note that the relevant measure of "popular" is not number of users, but number of people enthusiastic enough to actually contribute.)