I dont do tabs, full stop, I give people advice and the best advice I can give is, make your own basslines, dont copy other peoples. Lets not forget that these basslines were written by one person in the beginning and any tabber is stealing the original work. I will probably be heavily criticised for pointing this out and will leave the forum if certain people think I should go.
Marko, I am glad you are here and do not want you to leave.
Creating your own bass lines is capital advice, and I think that is where everyone who takes up the bass wants to get to in their playing - or it should be. However, getting there requires getting through a learning curve. I see tabs as a component of that learning curve.
Instruction, whether face-to-face or through an online source, paid or free, is not limited to learning scales, arpeggios, etc.; it includes learning songs. This is where tabs and sheet music (for those who can read music) are invaluable. A beginning student who learns to play a song is going to be much more committed than the poor sod who walks out of a first lesson knowing a scale. That's my experience anyway.
I see, and use, tabs as an instructional tool. If an instructor shows someone how to play a song or riff, is that stealing? How many aspiring-guitar-player-thieves have stolen from Led Zeppelin by walking into a guitar shop and playing the Stairway to Heaven riff? I don't accept your premise that playing the same bass line or riff that another bass player has played and/or recorded is thievery.
If I received any kind of monetary compensation for making tabs and did not have a license to use that music, then that would be stealing. Fair use under copyright law allows noncommercial, educational use of copyrighted material. If I believed that tabbing was thievery, I would not tab songs. In writing a tab, I hope to help someone learn to be a better bass player, as well as learn myself from more accomplished, professional players (Sid Vicious excepted, though he is in the Rock and Roll Hall of Fame, which I will never be!)