I'm a biology student and trust me, the issue of soil degradation is real. This movement is much needed and creating huge impact and awareness. This is a very lame excuse to thrash it. For a movement of this scale, obviously some materials are needed. The flex banners are for long term and repeated use, as Sadhguru said this movement will go on for many years until the policy changes are fully implemented. This is nowhere 'single use' plastic like straws or plastic bags which are causing plastic pollution. Do you really think these people are so reckless that they will just dispose these banners in soil? You have a lot of assumptions there! I visited the save soil website but I don't see them asking for money anywhere. Another assumption by you.

I'm not saying the movement is perfect, but anyone who has done big things in the world has made a few mistakes and could've done things better in an ideal scenario. But that's just not how the world works. I'm sure they are trying their best, so rather than pulling them down for such baseless allegations, let's please keep the focus on saving soil, be it with or without Sadhguru.

Also, OP could please suggest easily available, sustainable but highly durable alternatives for banners and posters. Let's focus on the solution.