No.

Gab is based on Mastodon which uses bcrypt to store password hashes. There are no rainbow tables for bcrypt for anything 8 characters or less. For under 8 characters, the rainbow tables would be ~211 296 876 372 480 bytes in size. Plausible given current storage but very unlikely.

Edit: And this calculation is probably off by an order of magnitude as I forgot about the salt and was basing this off the hash length.

Edit edit: Plus a 16 byte salt renders rainbow tables completely useless.

No.

Gab is based on Mastodon which uses bcrypt to store password hashes. There are no rainbow tables for bcrypt for anything 8 characters or less. For under 8 characters, the rainbow tables would be ~211 296 876 372 480 bytes in size. Plausible given current storage but very unlikely.

Edit: And this calculation is probably off by an order of magnitude as I forgot about the salt and was basing this off the hash length.